feat: AI routing DB-driven, payment gateway full integration, WeChat mini-program CI/CD

- AI routing rules now stored in system_configs DB table instead of hardcoded config
- Multi-model support via name|model composite key for same-provider routing
- UnifiedPayService with HMAC-SHA256 gateway integration (alipay/wechat)
- Admin payment panel: list, stats, search, filter, refund
- WeChat mini-program CI/CD via miniprogram-ci (v1.0.9)
- Translation quota extended to LLM provider tier
- SearchService with DB-driven provider config (bing/google_cse/searxng)
- Footer cleanup across admin/workspace/uni-app
- Private key excluded from git tracking

backend/app/services/search.py

@@ -41,6 +41,13 @@ class SearchService:
             return await searxng_search(provider.api_endpoint, query, limit)
         elif pt == "bing":
             return await bing_search(provider.api_key, query, limit)
+        elif pt == "google_cse":
+            return await google_cse_search(
+                api_key=provider.api_key,
+                cx=provider.extra_config.get("cx", "") if provider.extra_config else "",
+                query=query,
+                limit=limit,
+            )
         else:
             raise ValueError(f"Unknown provider type: {pt}")
 
@@ -100,3 +107,30 @@ async def bing_search(api_key: Optional[str], query: str, limit: int) -> List[Di
                 break
         return results
 
+
+async def google_cse_search(api_key: Optional[str], cx: Optional[str], query: str, limit: int) -> List[Dict[str, str]]:
+    if not api_key or not cx:
+        raise ValueError("Google CSE API key or CX not configured")
+    import httpx
+    async with httpx.AsyncClient(timeout=15.0) as client:
+        resp = await client.get(
+            "https://www.googleapis.com/customsearch/v1",
+            params={"key": api_key, "cx": cx, "q": query, "num": min(limit, 10), "lr": "lang_en"},
+        )
+        if resp.status_code != 200:
+            raise ValueError(f"Google CSE returned {resp.status_code}")
+        data = resp.json()
+        results = []
+        for item in data.get("items", []):
+            url = item.get("link", "")
+            if any(d in url for d in IGNORE_DOMAINS):
+                continue
+            results.append({
+                "title": (item.get("title") or url)[:100],
+                "url": url.rstrip("/"),
+                "snippet": (item.get("snippet") or "")[:200],
+            })
+            if len(results) >= limit:
+                break
+        return results
+