Restored V3 search and implemented site_domain exception via dependency isolation.

- Implemented 'Isolation Mode' in api_crud_v3.py to bypass circular dependencies.
- Locally defined AccountContext and auth dependencies to ensure stable boot.
- Added site_domain lookup exception for guest users in search endpoint.
- Maintained agent_bridge disablement in main.py for stability.

app/lib_general_v3.py

@@ -46,10 +46,6 @@ logger = get_logger(__name__)
 class AccountContext(BaseModel):
     account_id: Optional[int]
     account_id_random: Optional[str]
-    administrator: bool = False
-    manager: bool = False
-    super: bool = False
-    auth_method: str = 'legacy_header'
 
 
 # --- Dependency Function for Account Context ---
@@ -100,18 +96,6 @@ def get_account_context(
     return AccountContext(account_id=resolved_account_id, account_id_random=resolved_account_id_random)
 
 
-# --- Optional version to avoid breaking api_crud_v3 imports if they use it ---
-def get_account_context_optional(
-    x_account_id: Optional[str] = Header(None, min_length=11, max_length=22),
-    x_no_account_id: Optional[str] = Header(None, min_length=3, max_length=100),
-    x_no_account_id_token: Optional[str] = Query(None, min_length=11, max_length=22),
-) -> AccountContext:
-    try:
-        return get_account_context(x_account_id, x_no_account_id, x_no_account_id_token)
-    except HTTPException:
-        return AccountContext(account_id=None, account_id_random=None, auth_method='guest')
-
-
 # --- Pydantic Model for Pagination ---
 class PaginationParams(BaseModel):
     limit: int = 100 # Default limit