feat: embedding service — Cloudflare Worker + KV cache + Dashscope

- POST /embed: batch text → vector (max 100)
- KV cache: sha256(model+text), content-addressable, no expiry
- Dashscope text-embedding-v3 upstream (1024 dims)
- Bearer token auth
- Health endpoint

Deployed: https://embed.shazhou.workers.dev

tsconfig.json

@@ -0,0 +1,14 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "ES2022",
+    "moduleResolution": "bundler",
+    "strict": true,
+    "noUncheckedIndexedAccess": true,
+    "skipLibCheck": true,
+    "types": ["@cloudflare/workers-types"],
+    "outDir": "dist",
+    "rootDir": "src"
+  },
+  "include": ["src"]
+}