Remove REST API, keep GraphQL as sole API

- Add missing GraphQL mutations: retryJob, updateAsset, deleteAsset
- Add UpdateAssetRequest and DeleteResult to schema source of truth
- Move Lambda callback endpoint to main.py (only REST endpoint)
- Remove REST routes, pydantic schemas, and deps
- Remove pydantic target from modelgen.json
- Update architecture diagrams and documentation

schema/models/__init__.py

@@ -5,7 +5,13 @@ This module exports all dataclasses, enums, and constants that the generator
 should process. Add new models here to have them included in generation.
 """
 
-from .api import CreateJobRequest, ScanResult, SystemStatus
+from .api import (
+    CreateJobRequest,
+    DeleteResult,
+    ScanResult,
+    SystemStatus,
+    UpdateAssetRequest,
+)
 from .grpc import (
     GRPC_SERVICE,
     CancelRequest,
@@ -26,7 +32,14 @@ DATACLASSES = [MediaAsset, TranscodePreset, TranscodeJob]
 
 # API request/response models - generates TypeScript only (no Django)
 # WorkerStatus from grpc.py is reused here
-API_MODELS = [CreateJobRequest, SystemStatus, ScanResult, WorkerStatus]
+API_MODELS = [
+    CreateJobRequest,
+    UpdateAssetRequest,
+    SystemStatus,
+    ScanResult,
+    DeleteResult,
+    WorkerStatus,
+]
 
 # Status enums - included in generated code
 ENUMS = [AssetStatus, JobStatus]
@@ -50,6 +63,8 @@ __all__ = [
     "TranscodeJob",
     # API Models
     "CreateJobRequest",
+    "UpdateAssetRequest",
+    "DeleteResult",
     "ScanResult",
     "SystemStatus",
     # Enums