feat: webhook CRUD API + schemas

app/schemas/webhook.py

@@ -0,0 +1,43 @@
+from pydantic import BaseModel
+from typing import Optional
+from datetime import datetime
+
+
+class WebhookCreate(BaseModel):
+    url: str
+    secret: Optional[str] = None
+    events: str  # comma-separated: "issue.created,issue.updated"
+    project_id: Optional[int] = None
+    is_active: bool = True
+
+
+class WebhookUpdate(BaseModel):
+    url: Optional[str] = None
+    secret: Optional[str] = None
+    events: Optional[str] = None
+    is_active: Optional[bool] = None
+
+
+class WebhookResponse(BaseModel):
+    id: int
+    url: str
+    events: str
+    project_id: Optional[int]
+    is_active: bool
+    created_at: datetime
+
+    class Config:
+        from_attributes = True
+
+
+class WebhookLogResponse(BaseModel):
+    id: int
+    webhook_id: int
+    event: str
+    payload: str
+    response_status: Optional[int]
+    success: bool
+    created_at: datetime
+
+    class Config:
+        from_attributes = True