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/app/question_combination_fill_prompt.go

@@ -0,0 +1,75 @@
+package app
+
+import (
+	"encoding/json"
+	"fmt"
+	"strings"
+)
+
+var questionCombinationFillSchema = []byte(`{
+  "type": "object",
+  "additionalProperties": false,
+  "properties": {
+    "region": {
+      "type": "array",
+      "maxItems": 4,
+      "items": { "type": "string", "minLength": 1, "maxLength": 16 }
+    },
+    "prefix": {
+      "type": "array",
+      "maxItems": 4,
+      "items": { "type": "string", "minLength": 1, "maxLength": 16 }
+    },
+    "core": {
+      "type": "array",
+      "maxItems": 4,
+      "items": { "type": "string", "minLength": 1, "maxLength": 18 }
+    },
+    "industry": {
+      "type": "array",
+      "maxItems": 4,
+      "items": { "type": "string", "minLength": 1, "maxLength": 18 }
+    },
+    "suffix": {
+      "type": "array",
+      "maxItems": 4,
+      "items": { "type": "string", "minLength": 1, "maxLength": 16 }
+    }
+  },
+  "required": ["region", "prefix", "core", "industry", "suffix"]
+}`)
+
+func buildQuestionCombinationFillPrompt(brandCtx *questionBrandContext, regionTerms []string, req QuestionCombinationFillRequest) string {
+	competitors := "无"
+	if len(brandCtx.CompetitorNames) > 0 {
+		encoded, _ := json.Marshal(brandCtx.CompetitorNames)
+		competitors = string(encoded)
+	}
+	hints, _ := json.Marshal(req)
+	return fmt.Sprintf(`你是中国 GEO 搜索问题拓展策略师。请为“拓词工具”的 5 个词列生成高频、核心、可组合的问题词组。
+
+【品牌信息】
+- 品牌: %s
+- 官网: %s
+- 描述: %s
+- 竞品: %s
+
+【地域优先词】
+%s
+
+【当前输入，仅作为语义参考，可改写】
+%s
+
+【输出要求】
+1. region 使用地域优先词，不要编造不存在的城市；没有有效地域时可输出全国、本地、华东等泛地域词。
+2. prefix/core/industry/suffix 各输出 3 到 4 个词，必须短、热、可直接拼成搜索问题。
+3. core 要贴近品牌最核心的搜索需求；industry 要贴近行业/品类；suffix 偏“哪家好、怎么选、推荐、多少钱”等高转化问法。
+4. 不要输出完整问题，不要带标点，不要解释，严格按 JSON Schema 输出。`,
+		strings.TrimSpace(brandCtx.BrandName),
+		strings.TrimSpace(nilToString(brandCtx.Website)),
+		strings.TrimSpace(nilToString(brandCtx.Description)),
+		competitors,
+		strings.Join(regionTerms, "、"),
+		string(hints),
+	)
+}