fix(permissions): fix 10 high-priority permission system issues

P8: Invalidate all Redis sessions when is_system_admin changes
- Added is_system_admin to UserUpdate schema and UserResponse
- Added invalidate_all_user_sessions call in users.py route
- Added is_system_admin param to user_service.update_user

P9: Remove no-op permission resolution strategies
- Only highest_wins supported, others removed as no-ops
- Updated tenant.py CheckConstraint to only allow highest_wins
- Added KI-Kommentar in permissions.py

P10: Remove legacy check_permission from auth.py
- Removed duplicate check_permission and filter_fields_by_permission
- Fixed ai_copilot_service.py to use permissions.check_permission
- Updated ai_copilot route to pass resolved permissions dict

P11: Verified — no guest_users remnants found

P12: Migrate ContactFolderPermission to EntityPermission
- contact_folder_permission_service now delegates to entity_permission_service
- contact_folder_service uses EntityPermission queries
- Removed ContactFolderPermission from models/__init__.py
- Created migration 0114 to migrate data and drop table

P13: Added RLS migration history comment in alembic/env.py

P14: Verified — services already apply visibility_filter
- saved_filters/views filter by user_id (personal data)
- workspaces are UI context only
- notifications already filter by entity access

P15: Split entity_permission_service.py (932 lines) into 4 modules
- permission_resolver.py: get_effective_access, get_visible_ids, etc.
- permission_cache.py: Redis caching functions
- permission_audit.py: Audit logging helpers
- entity_permission_service.py: CRUD operations + re-exports

P16: Centralize PERM_RANK in permissions.py
- Single source: app.core.permissions.PERM_RANK
- Updated all services to import from permissions.py

P17: Fix MIGRATION_DATABASE_URL to use crm_migration
- docker-compose.yaml defaults changed from crm_user to crm_migration
- .env.docker.example updated
- prestart.sh comment updated

app/services/ai_copilot_service.py

@@ -11,7 +11,7 @@ from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.ai.llm_client import get_llm_client
 from app.core.audit import log_audit
-from app.core.auth import check_permission
+from app.core.permissions import check_permission
 from app.core.visibility import apply_visibility_filter
 from app.core.visibility import check_single_entity_access
 from app.models.ai_conversation import AIConversation, AIMessage
@@ -159,7 +159,7 @@ async def execute_action(
     db: AsyncSession,
     tenant_id: uuid.UUID,
     user_id: uuid.UUID,
-    role: str,
+    resolved: dict[str, Any],
     conversation_id: str,
     action: dict[str, Any],
     is_system_admin: bool = False,
@@ -191,8 +191,9 @@ async def execute_action(
 
     # Determine module and action_type from path for RBAC
     module, action_type = _derive_rbac_from_path(method, path)
+    required_perm = f"{module}:{action_type}"
 
-    if not check_permission(role, module, action_type):
+    if not check_permission(resolved, required_perm):
         return {
             "error": "Insufficient permissions for this action",
             "status_code": 403,