fix(web): correct China-network install snippet (#1104 follow-up) (#1121)

DeepSeek's official API has a single endpoint, https://api.deepseek.com,
with servers physically in China. There is no separate mainland endpoint,
and api.deepseeki.com is a typo grandfathered into the source.

The /zh/install "国内 API 访问" panel previously suggested users set a
custom base_url to a China endpoint, which doesn't exist. Replace with
the truth: the default works for mainland users; only override
DEEPSEEK_BASE_URL if you have a private mirror.

Also re-runs derive-facts to keep facts.generated.ts at 9 providers.

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

web/lib/facts.generated.ts

@@ -18,7 +18,7 @@ export interface RepoFacts {
 }
 
 export const FACTS: RepoFacts = {
-  "generatedAt": "2026-05-08T01:33:23.678Z",
+  "generatedAt": "2026-05-08T02:25:40.439Z",
   "version": "0.8.18",
   "crates": [
     "agent",