feat(14-03): cache settings/status API and security tests

- api/cloud/cache.py: GET /analysis/cache, PATCH /analysis/cache/settings
- api/cloud/analysis.py: analysis router aggregator (Phase 14 parent)
- schemas.py: CacheStatusOut, CacheSettingsUpdateRequest (explicit allowlists)
- __init__.py: register analysis_router under /api/cloud
- 7 new security tests: admin block, unauthenticated block, object_key exclusion,
  response structure, enum validation, tier cap enforcement (T-14-01..02, T-14-08)
- All 47 plan target tests pass (test_cloud_cache.py + test_cloud_security.py)

backend/api/cloud/__init__.py

@@ -17,6 +17,7 @@ from sqlalchemy.ext.asyncio import AsyncSession
 from api.cloud.connections import router as connections_router, _VALID_BACKENDS
 from api.cloud.browse import router as browse_router
 from api.cloud.operations import router as operations_router
+from api.cloud.analysis import router as analysis_router
 from db.models import User
 from deps.auth import get_regular_user
 from deps.db import get_db
@@ -26,6 +27,7 @@ router = APIRouter(prefix="/api/cloud", tags=["cloud"])
 router.include_router(connections_router)
 router.include_router(browse_router)
 router.include_router(operations_router)
+router.include_router(analysis_router)
 
 # ── Users router (default storage) ───────────────────────────────────────────
 

backend/api/cloud/analysis.py

@@ -0,0 +1,29 @@
+"""
+Cloud analysis API package — Phase 14 router aggregator.
+
+Provides the /analysis sub-router tree under /api/cloud.  All routes are
+owner-scoped and blocked for admin accounts (get_regular_user enforced at
+each leaf router).
+
+Currently registered routes:
+  GET  /analysis/cache          — cache usage/settings (cloud/cache.py)
+  PATCH /analysis/cache/settings — update settings    (cloud/cache.py)
+
+Future routes (Phase 14 plans 04-09):
+  POST  /analysis/connections/{id}/estimate
+  POST  /analysis/connections/{id}/jobs
+  GET   /analysis/jobs/{id}
+  POST  /analysis/jobs/{id}/cancel
+  POST  /analysis/jobs/{id}/items/{item_id}/skip
+
+Module is importable as api.cloud.analysis for tests and callers that verify
+router registration before endpoint implementation is complete.
+"""
+from __future__ import annotations
+
+from fastapi import APIRouter
+
+from api.cloud.cache import router as cache_router
+
+router = APIRouter()
+router.include_router(cache_router)

backend/api/cloud/cache.py

@@ -0,0 +1,137 @@
+"""
+Cache settings and status endpoint — Phase 14.
+
+Owner-scoped endpoints for the byte cache.  Admin users are blocked by
+get_regular_user (T-14-01, T-14-06).
+
+Route family:
+  GET   /analysis/cache          — current cache usage and user settings
+  PATCH /analysis/cache/settings — update analysis preferences and cache limit
+
+Security invariants (T-14-02, T-14-08):
+  - object_key, credentials_enc, and raw provider URLs must never appear in any
+    response body.
+  - All queries are scoped to current_user.id — no cross-user access is possible.
+"""
+from __future__ import annotations
+
+from typing import Optional
+
+from fastapi import APIRouter, Depends, HTTPException, Request, status
+from sqlalchemy import func, select
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from api.cloud.schemas import CacheStatusOut, CacheSettingsUpdateRequest
+from db.models import CloudByteCacheEntry, User
+from deps.auth import get_regular_user
+from deps.db import get_db
+from services.cloud_analysis_settings import (
+    DEFAULT_MAX_CACHE_LIMIT_BYTES,
+    get_or_create_user_analysis_settings,
+    update_user_analysis_settings,
+)
+from services.rate_limiting import account_limiter
+
+router = APIRouter()
+
+
+@router.get("/analysis/cache", response_model=CacheStatusOut)
+@account_limiter.limit("120/minute")
+async def get_cache_status(
+    request: Request,
+    session: AsyncSession = Depends(get_db),
+    current_user: User = Depends(get_regular_user),
+) -> CacheStatusOut:
+    """Return cache usage totals and analysis settings for the current user.
+
+    Returns aggregate byte/count totals (no object_key or credentials).
+    Blocked for admin accounts (T-14-01).
+    """
+    request.state.current_user = current_user
+
+    # Aggregate active (non-evicted) cache entries for this user
+    result = await session.execute(
+        select(
+            func.count(CloudByteCacheEntry.id).label("entry_count"),
+            func.coalesce(func.sum(CloudByteCacheEntry.size_bytes), 0).label("total_bytes"),
+        ).where(
+            CloudByteCacheEntry.user_id == current_user.id,
+            CloudByteCacheEntry.evicted_at.is_(None),
+        )
+    )
+    row = result.one()
+    entry_count = int(row.entry_count)
+    total_bytes = int(row.total_bytes)
+
+    # Fetch or create settings (never fails — creates defaults on first access)
+    settings = await get_or_create_user_analysis_settings(
+        session, user_id=current_user.id
+    )
+
+    return CacheStatusOut(
+        entry_count=entry_count,
+        total_bytes=total_bytes,
+        cache_limit_bytes=settings.cloud_cache_limit_bytes,
+        tier_cap_bytes=DEFAULT_MAX_CACHE_LIMIT_BYTES,
+        analysis_progress_detail=settings.analysis_progress_detail,
+        analysis_failure_behavior=settings.analysis_failure_behavior,
+    )
+
+
+@router.patch("/analysis/cache/settings", response_model=CacheStatusOut)
+@account_limiter.limit("30/minute")
+async def update_cache_settings(
+    request: Request,
+    body: CacheSettingsUpdateRequest,
+    session: AsyncSession = Depends(get_db),
+    current_user: User = Depends(get_regular_user),
+) -> CacheStatusOut:
+    """Update analysis preferences and/or the user's cache byte limit.
+
+    Only provided (non-None) fields are updated.  Enum and bounds validation
+    is performed by the service layer (raises ValueError; we re-raise as 422).
+    Blocked for admin accounts (T-14-01).
+    """
+    request.state.current_user = current_user
+
+    try:
+        await update_user_analysis_settings(
+            session,
+            user_id=current_user.id,
+            analysis_progress_detail=body.analysis_progress_detail,
+            analysis_failure_behavior=body.analysis_failure_behavior,
+            cloud_cache_limit_bytes=body.cloud_cache_limit_bytes,
+            max_cache_limit_bytes=DEFAULT_MAX_CACHE_LIMIT_BYTES,
+        )
+    except ValueError as exc:
+        raise HTTPException(
+            status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,
+            detail=str(exc),
+        ) from exc
+
+    await session.commit()
+
+    # Return fresh status after update
+    result = await session.execute(
+        select(
+            func.count(CloudByteCacheEntry.id).label("entry_count"),
+            func.coalesce(func.sum(CloudByteCacheEntry.size_bytes), 0).label("total_bytes"),
+        ).where(
+            CloudByteCacheEntry.user_id == current_user.id,
+            CloudByteCacheEntry.evicted_at.is_(None),
+        )
+    )
+    row = result.one()
+
+    settings = await get_or_create_user_analysis_settings(
+        session, user_id=current_user.id
+    )
+
+    return CacheStatusOut(
+        entry_count=int(row.entry_count),
+        total_bytes=int(row.total_bytes),
+        cache_limit_bytes=settings.cloud_cache_limit_bytes,
+        tier_cap_bytes=DEFAULT_MAX_CACHE_LIMIT_BYTES,
+        analysis_progress_detail=settings.analysis_progress_detail,
+        analysis_failure_behavior=settings.analysis_failure_behavior,
+    )

backend/api/cloud/schemas.py

@@ -9,6 +9,10 @@ Phase 13 additions:
   - ReconnectOut: typed reconnect response (CONN-01..03)
   - ContentResultOut: typed open/preview/download response (D-02, D-18, T-13-14)
   - MutationResultOut: typed kind/reason mutation response (D-05..11)
+
+Phase 14 additions:
+  - CacheStatusOut: aggregate cache usage + settings response (T-14-02, T-14-08)
+  - CacheSettingsUpdateRequest: PATCH body for updating analysis settings/cache limit
 """
 from __future__ import annotations
 
@@ -202,3 +206,52 @@ class MoveItemRequest(BaseModel):
     destination_parent_ref: str
     destination_connection_id: Optional[str] = None
     etag: Optional[str] = None
+
+
+# ── Phase 14 cache schemas ─────────────────────────────────────────────────────
+
+class CacheStatusOut(BaseModel):
+    """Aggregate cache usage and user analysis settings.
+
+    T-14-02: object_key, credentials_enc, and raw provider URLs are absent by
+    design.  This schema is a strict allowlist — no internal MinIO keys or
+    credentials can leak through it.
+
+    entry_count:              Number of active (non-evicted) cache entries.
+    total_bytes:              Sum of size_bytes across active entries.
+    cache_limit_bytes:        User's preferred cache byte ceiling.
+    tier_cap_bytes:           Maximum allowed cache limit for this tier.
+    analysis_progress_detail: "simple" | "detailed" — default "simple".
+    analysis_failure_behavior:"pause_batch" | "continue_item" — default "pause_batch".
+    """
+
+    entry_count: int = 0
+    total_bytes: int = 0
+    cache_limit_bytes: int
+    tier_cap_bytes: int
+    analysis_progress_detail: str
+    analysis_failure_behavior: str
+
+
+class CacheSettingsUpdateRequest(BaseModel):
+    """PATCH body for updating analysis preferences and cache limit.
+
+    Only provided (non-None) fields are applied.  Enum validation and bounds
+    checking are performed in the service layer.
+
+    Mass-assignment prevention: only the three fields below are accepted.
+    """
+
+    analysis_progress_detail: Optional[str] = Field(
+        default=None,
+        description="Progress label verbosity: 'simple' or 'detailed'",
+    )
+    analysis_failure_behavior: Optional[str] = Field(
+        default=None,
+        description="Batch failure mode: 'pause_batch' or 'continue_item'",
+    )
+    cloud_cache_limit_bytes: Optional[int] = Field(
+        default=None,
+        ge=1,
+        description="Preferred byte ceiling for the local byte cache",
+    )