fix(web): revalidate app assets and rename compose example

reaction_board/web/server.py

@@ -397,13 +397,17 @@ border-color:#3a2c22;color:#f3e9dc}button{background:#e9b97c;color:#2a1a10}}
         }:
             content_type += "; charset=utf-8"
         payload = target.read_bytes()
+        vendor_root = (STATIC_ROOT / "vendor").resolve()
+        try:
+            target.relative_to(vendor_root)
+            cache_control = "public, max-age=86400"
+        except ValueError:
+            # 应用自身的 JS/CSS/HTML 每次重新校验，保证升级后浏览器立刻拿到新版。
+            cache_control = "no-cache"
         self.send_response(HTTPStatus.OK)
         self.send_header("Content-Type", content_type)
         self.send_header("Content-Length", str(len(payload)))
-        self.send_header(
-            "Cache-Control",
-            "no-cache" if target.name == "index.html" else "public, max-age=3600",
-        )
+        self.send_header("Cache-Control", cache_control)
         self._security_headers()
         self.end_headers()
         if method != "HEAD":