feat(chat): migration 0004 + errs codes for chat/llm/storage

internal/infra/errs/errs_test.go

@@ -51,6 +51,25 @@ func TestHTTPStatus(t *testing.T) {
 		CodeWorktreePathInvalid:     http.StatusBadRequest,
 		CodeGitCredentialInvalid:    http.StatusBadRequest,
 		CodeWorktreeNotHeldByCaller: http.StatusForbidden,
+		// Chat codes
+		CodeChatConversationNotFound:      http.StatusNotFound,
+		CodeChatMessageNotFound:           http.StatusNotFound,
+		CodeChatMessageNotPending:         http.StatusConflict,
+		CodeChatConcurrentMessage:         http.StatusConflict,
+		CodeChatAttachmentTooLarge:        http.StatusRequestEntityTooLarge,
+		CodeChatAttachmentUnsupportedMime: http.StatusUnsupportedMediaType,
+		CodeChatModelCapabilityMismatch:   http.StatusConflict,
+		CodeChatTemplateNotFound:          http.StatusNotFound,
+		CodeChatEndpointNotFound:          http.StatusNotFound,
+		CodeChatModelNotFound:             http.StatusNotFound,
+		// LLM codes
+		CodeLLMUpstream:       http.StatusBadGateway,
+		CodeLLMTimeout:        http.StatusGatewayTimeout,
+		CodeLLMRateLimited:    http.StatusTooManyRequests,
+		CodeLLMContextTooLong: http.StatusBadRequest,
+		// Storage codes
+		CodeStoragePutFailed: http.StatusBadGateway,
+		CodeStorageGetFailed: http.StatusBadGateway,
 	}
 	for code, want := range cases {
 		require.Equal(t, want, HTTPStatus(code), "code=%s", code)