feat(wire): add moderation and builtin hooks to post service wiring

Add wire providers for ModerationHooks and BuiltinHooks, injecting them
into PostService via dependency injection. Hooks are passed as blank
identifiers to trigger their initialization and registration side effects.

internal/pkg/hook/moderation_hooks.go

@@ -80,6 +80,10 @@ func (h *PostModerationHook) Execute(ctx *HookContext) error {
 			result.Approved = false
 			result.Error = err
 			result.ReviewedBy = "ai"
+			zap.L().Error("AI post moderation failed in strict mode, reject post",
+				zap.String("post_id", data.PostID),
+				zap.Error(err),
+			)
 			return nil
 		}
 
@@ -164,6 +168,10 @@ func (h *CommentModerationHook) Execute(ctx *HookContext) error {
 			result.Approved = false
 			result.Error = err
 			result.ReviewedBy = "ai"
+			zap.L().Error("AI comment moderation failed in strict mode, reject comment",
+				zap.String("comment_id", data.CommentID),
+				zap.Error(err),
+			)
 			return nil
 		}