feat(questions): make brand questions the primary monitoring & template axis

- add /questions/combination-fill endpoint with AI-driven, IP-region-aware matrix fill
- extract ip2region resolver from ops/app into shared/ipregion for cross-service use
- thread question_id filter through dashboard composite, citation summary, and collect-now
- switch template wizard from keyword inputs to brand-question selection (primary + supplemental)
- pass brand_question and supplemental_questions through assist/title/outline prompts
- add AiWaitingModal + 45s client timeout and request_timeout error mapping for long AI flows

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/http-client/src/index.ts

@@ -61,8 +61,11 @@ function normalizeError(error: unknown): ApiClientError {
 
   if (axios.isAxiosError(error)) {
     const payload = error.response?.data as Partial<ApiErrorEnvelope> | undefined
+    const isTimeout =
+      !error.response && (error.code === 'ECONNABORTED' || error.code === 'ETIMEDOUT')
+    const fallbackMessage = isTimeout ? 'request_timeout' : (error.message ?? 'network_error')
     return new ApiClientError({
-      message: payload?.message ?? error.message ?? 'network_error',
+      message: payload?.message ?? fallbackMessage,
       code: payload?.code ?? 50000,
       status: error.response?.status,
       detail: payload?.detail,