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>

server/internal/tenant/prompts/loader_test.go

@@ -47,7 +47,7 @@ func TestPlatformTemplateSeedsInjectPromptConfig(t *testing.T) {
 	if !strings.Contains(analyzePrompt, "推荐类文章做品牌与竞品分析") {
 		t.Fatalf("analyze_prompt_template = %q, want yaml-backed analyze prompt", analyzePrompt)
 	}
-	if !strings.Contains(analyzePrompt, "全屋定制哪家好") || !strings.Contains(analyzePrompt, "搜索查询词") {
+	if !strings.Contains(analyzePrompt, "全屋定制哪家好") || !strings.Contains(analyzePrompt, "搜索问题候选") {
 		t.Fatalf("analyze_prompt_template = %q, want question-like long-tail query guidance", analyzePrompt)
 	}
 	if !strings.Contains(titlePrompt, "推荐类文章生成 5 个候选标题") {
@@ -66,10 +66,10 @@ func TestAnalyzeFallbackPromptPrefersQuestionLikeQueries(t *testing.T) {
 
 	prompt := AnalyzeFallbackPrompt(`{"brand_name":"测试品牌","input_params":{"keyword":"全屋定制"}}`)
 	for _, want := range []string{
-		"真实用户会直接搜索的问题型长尾词",
-		"哪家好",
-		"最多返回 6 个竞品和 10 个关键词",
-	} {
+			"真实用户会直接搜索的问题型长尾词",
+			"哪家好",
+			"最多返回 6 个竞品和 10 个搜索问题候选",
+		} {
 		if !strings.Contains(prompt, want) {
 			t.Fatalf("AnalyzeFallbackPrompt() missing %q in prompt:\n%s", want, prompt)
 		}