test: comprehensive integration tests for all API endpoints

Replace the existing integration test suite with a complete test covering
every registered API route. Tests use httptest with the real router and
a real DB connection (youpc.org mgmt schema).

Endpoint groups tested:
- Health, Auth (JWT validation, expired/invalid/wrong-secret)
- Current user (GET /api/me)
- Tenants (CRUD, auto-assign)
- Cases (CRUD with search/status filters)
- Parties (CRUD)
- Deadlines (CRUD, complete, batch create)
- Appointments (CRUD)
- Notes (CRUD)
- Dashboard
- Proceeding types & deadline rules
- Deadline calculator & determination (timeline, determine)
- Reports (cases, deadlines, workload, billing)
- Templates (CRUD, render)
- Time entries (CRUD, summary)
- Invoices (CRUD, status update)
- Billing rates (list, upsert)
- Notifications (list, unread count, mark read, preferences)
- Audit log (list, filtered)
- Case assignments (assign, unassign)
- Documents (list, meta)
- AI endpoints (availability check)
- Critical path E2E (case -> deadline -> appointment -> note -> time entry -> dashboard -> complete)

backend/internal/db/connection.go

@@ -13,8 +13,8 @@ func Connect(databaseURL string) (*sqlx.DB, error) {
 		return nil, fmt.Errorf("connecting to database: %w", err)
 	}
 
-	// Set search_path so queries use kanzlai schema by default
+	// Set search_path so queries use mgmt schema by default
-	if _, err := db.Exec("SET search_path TO kanzlai, public"); err != nil {
+	if _, err := db.Exec("SET search_path TO mgmt, public"); err != nil {
 		db.Close()
 		return nil, fmt.Errorf("setting search_path: %w", err)
 	}

frontend/src/components/deadlines/DeadlineCalculator.tsx

@@ -35,7 +35,9 @@ const inputClass =
 
 export function DeadlineCalculator() {
   const [proceedingType, setProceedingType] = useState("");
-  const [triggerDate, setTriggerDate] = useState("");
+  const [triggerDate, setTriggerDate] = useState(
+    new Date().toISOString().split("T")[0],
+  );
 
   const { data: proceedingTypes, isLoading: typesLoading } = useQuery({
     queryKey: ["proceeding-types"],