feat(13-06): emit metadata-only audit rows on authoritative upload success

- Write cloud.file_uploaded audit row in same transaction as reconciliation
- Audit payload is metadata-only: filename, size_bytes, connection_id, provider_item_id, parent_ref
- No provider URLs, tokens, bytes, or document text in audit metadata (T-13-02)
- Non-success paths (conflict, offline, reauth_required) bypass audit write (T-13-21)
- Import get_client_ip from deps.utils and write_audit_log from services.audit

backend/api/cloud/operations.py

@@ -45,6 +45,8 @@ from config import settings
 from db.models import User
 from deps.auth import get_regular_user
 from deps.db import get_db
+from deps.utils import get_client_ip
+from services.audit import write_audit_log
 from services.cloud_items import ConnectionNotFound
 from services.rate_limiting import account_limiter
 from storage.cloud_base import (
@@ -683,6 +685,28 @@ async def upload_cloud_file(
                 error_message="Folder contents changed by upload — re-listing required.",
             )
 
+            # Write metadata-only audit row in the same transaction (Plan 06, Task 2: T-13-20).
+            # Only authoritative upload success reaches this path. Non-success outcomes
+            # (conflict, offline, reauth_required) are handled in separate branches below
+            # and never call write_audit_log — preserving T-13-21 (no false success events).
+            # The audit payload is metadata-only: no provider URLs, tokens, bytes, or
+            # document text are included (T-13-02).
+            await write_audit_log(
+                session,
+                event_type="cloud.file_uploaded",
+                user_id=current_user.id,
+                actor_id=current_user.id,
+                resource_id=None,
+                ip_address=get_client_ip(request),
+                metadata_={
+                    "connection_id": str(connection_id),
+                    "provider_item_id": provider_item_id,
+                    "filename": resolved_name,
+                    "size_bytes": resolved_size,
+                    "parent_ref": resolved_parent_ref,
+                },
+            )
+
             await session.commit()
 
         return {