refactor(api): introduce UserContext schema for API dependency injection

Replace direct User database model imports in API endpoints with UserContext
schema, following the architecture principle that API routes should not import
database models directly.

Changes:
- Create UserContext schema in models/schema/auth.py with from_user() factory
- Update app/api/deps.py to return UserContext from all auth dependencies
- Add _get_user_model() helper for functions needing User model access
- Update 58 API endpoint files to use UserContext instead of User
- Add noqa comments for 4 legitimate edge cases (enums, internal helpers)

Architecture validation: 0 errors (down from 61), 11 warnings remain

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/api/v1/admin/logs.py

@@ -22,7 +22,7 @@ from app.exceptions import ConfirmationRequiredException, ResourceNotFoundExcept
 from app.services.admin_audit_service import admin_audit_service
 from app.services.admin_settings_service import admin_settings_service
 from app.services.log_service import log_service
-from models.database.user import User
+from models.schema.auth import UserContext
 from models.schema.admin import (
     ApplicationLogFilters,
     ApplicationLogListResponse,
@@ -56,7 +56,7 @@ def get_database_logs(
     skip: int = Query(0, ge=0),
     limit: int = Query(100, ge=1, le=1000),
     db: Session = Depends(get_db),
-    current_admin: User = Depends(get_current_admin_api),
+    current_admin: UserContext = Depends(get_current_admin_api),
 ):
     """
     Get logs from database with filtering.
@@ -82,7 +82,7 @@ def get_database_logs(
 def get_log_statistics(
     days: int = Query(7, ge=1, le=90, description="Number of days to analyze"),
     db: Session = Depends(get_db),
-    current_admin: User = Depends(get_current_admin_api),
+    current_admin: UserContext = Depends(get_current_admin_api),
 ):
     """
     Get log statistics for the last N days.
@@ -97,7 +97,7 @@ def cleanup_old_logs(
     retention_days: int = Query(30, ge=1, le=365),
     confirm: bool = Query(False, description="Must be true to confirm cleanup"),
     db: Session = Depends(get_db),
-    current_admin: User = Depends(get_current_admin_api),
+    current_admin: UserContext = Depends(get_current_admin_api),
 ):
     """
     Delete logs older than retention period.
@@ -129,7 +129,7 @@ def cleanup_old_logs(
 def delete_log(
     log_id: int,
     db: Session = Depends(get_db),
-    current_admin: User = Depends(get_current_admin_api),
+    current_admin: UserContext = Depends(get_current_admin_api),
 ):
     """Delete a specific log entry."""
     message = log_service.delete_log(db, log_id)
@@ -154,7 +154,7 @@ def delete_log(
 
 @router.get("/files", response_model=LogFileListResponse)
 def list_log_files(
-    current_admin: User = Depends(get_current_admin_api),
+    current_admin: UserContext = Depends(get_current_admin_api),
 ):
     """
     List all available log files.
@@ -168,7 +168,7 @@ def list_log_files(
 def get_file_log(
     filename: str,
     lines: int = Query(500, ge=1, le=10000, description="Number of lines to read"),
-    current_admin: User = Depends(get_current_admin_api),
+    current_admin: UserContext = Depends(get_current_admin_api),
 ):
     """
     Read log file content.
@@ -181,7 +181,7 @@ def get_file_log(
 @router.get("/files/{filename}/download")
 def download_log_file(
     filename: str,
-    current_admin: User = Depends(get_current_admin_api),
+    current_admin: UserContext = Depends(get_current_admin_api),
 ):
     """
     Download log file.
@@ -237,7 +237,7 @@ def download_log_file(
 @router.get("/settings", response_model=LogSettingsResponse)
 def get_log_settings(
     db: Session = Depends(get_db),
-    current_admin: User = Depends(get_current_admin_api),
+    current_admin: UserContext = Depends(get_current_admin_api),
 ):
     """Get current log configuration settings."""
     log_level = admin_settings_service.get_setting_value(db, "log_level", "INFO")
@@ -271,7 +271,7 @@ def get_log_settings(
 def update_log_settings(
     settings_update: LogSettingsUpdate,
     db: Session = Depends(get_db),
-    current_admin: User = Depends(get_current_admin_api),
+    current_admin: UserContext = Depends(get_current_admin_api),
 ):
     """
     Update log configuration settings.