feat(models): AiderEventIn + AiderBatchIn pydantic schemas

- Implement aider-watch v2 event schema with 7 event types
- Enforce timezone-aware timestamps via field_validator
- Batch schema supports up to 50 events per request
- Frozen + forbid extra fields (defensive engineering)
- Fix broken src.* imports in models package (incident.py, __init__.py)

Task A3 complete: 7/7 tests passing

apps/api/src/models/__init__.py

@@ -10,7 +10,7 @@ AWOOOI Models Package
 """
 
 # Approval Models (Phase 2)
-from src.models.approval import (
+from apps.api.src.models.approval import (
     ApprovalRequest,
     ApprovalRequestCreate,
     ApprovalRequestResponse,
@@ -28,7 +28,7 @@ from src.models.approval import (
 )
 
 # Incident Models (Phase 6 - 認知覺醒)
-from src.models.incident import (
+from apps.api.src.models.incident import (
     AIDecisionChain,
     Incident,
     IncidentCreate,
@@ -41,7 +41,7 @@ from src.models.incident import (
 )
 
 # NVIDIA Models (ADR-036 - Nemotron Tool Calling)
-from src.models.nvidia import (
+from apps.api.src.models.nvidia import (
     NvidiaProviderResult,
     NvidiaResponse,
     NvidiaUsage,
@@ -50,6 +50,13 @@ from src.models.nvidia import (
     ToolDefinition,
 )
 
+# Aider Models (aider-watch v2)
+from apps.api.src.models.aider import (
+    AiderBatchIn,
+    AiderEventIn,
+    EventType,
+)
+
 __all__ = [
     # Approval
     "ApprovalRequest",
@@ -83,4 +90,8 @@ __all__ = [
     "ToolCall",
     "ToolCallValidationResult",
     "ToolDefinition",
+    # Aider (aider-watch v2)
+    "AiderBatchIn",
+    "AiderEventIn",
+    "EventType",
 ]