fix: serve WebUI static files directly, proxy /assets/* to client dir

- /webui serves index.html from webui-client
- /assets/*, /favicon* served from webui-client directly
- /api/* still proxied to BFF on :6060
- Avoid BFF / route issue by serving static files locally

entry.py

@@ -390,31 +390,48 @@ class ProxyHandler(BaseHTTPRequestHandler):
         if path == "/api/logs/stream":
             return self._handle_sse()
 
-        # ── WebUI BFF routes: /webui, /webui/*, /api/*, /v1/*, /assets/*,
-        #    /favicon*, /health, /upload, /webhook → all proxy to BFF ──
-        # The BFF handles SPA fallback for unknown paths.
-        is_webui_path = (
-            path.startswith("/webui") or
-            path.startswith("/api/") or
-            path.startswith("/v1/") or
-            path.startswith("/assets/") or
-            path.startswith("/favicon") or
-            path == "/health" or
-            path == "/upload" or
-            path == "/webhook" or
-            path.startswith("/socket.io/")
-        )
-        if is_webui_path:
-            # Rewrite /webui/* to /* for BFF (it serves from its own static dir)
-            if path.startswith("/webui") and len(path) > 5:
-                bff_path = path[5:]  # /webui/assets/foo → /assets/foo
-                if not bff_path:
-                    bff_path = "/"
-            elif path == "/webui":
-                bff_path = "/"
-            else:
-                bff_path = self.path
-            return self._forward_to_webui(bff_path + ("?" + qs if qs else ""), "GET")
+        # ── WebUI SPA: /webui, /webui/* → serve from webui-client static dir ──
+        if path.startswith("/webui"):
+            # Map /webui → /, /webui/xxx → /xxx for the static dir
+            if path in ("/webui", "/webui/"):
+                index_path = os.path.join(WEBUI_CLIENT_DIR, "index.html")
+                if os.path.isfile(index_path):
+                    return self._send_html(index_path)
+            # Try static file
+            static_path = os.path.join(WEBUI_CLIENT_DIR, path[len("/webui"):].lstrip("/"))
+            if os.path.isfile(static_path):
+                return self._send_file(static_path)
+            # SPA fallback
+            index_path = os.path.join(WEBUI_CLIENT_DIR, "index.html")
+            if os.path.isfile(index_path):
+                return self._send_html(index_path)
+            # Final fallback: proxy to BFF
+            return self._forward_to_webui(path[5:] or "/", "GET")
+
+        # ── WebUI static assets (referenced by SPA as /assets/*, /favicon*) ──
+        # These must be served from webui-client dir because the SPA uses absolute paths
+        if path.startswith("/assets/") or path.startswith("/favicon") or path == "/logo.png":
+            static_path = os.path.join(WEBUI_CLIENT_DIR, path.lstrip("/"))
+            if os.path.isfile(static_path):
+                return self._send_file(static_path)
+            # If not found locally, try proxying to BFF
+            return self._forward_to_webui(self.path, "GET")
+
+        # ── WebUI API routes: /api/*, /v1/* → proxy to WebUI BFF ──
+        if path.startswith("/api/") or path.startswith("/v1/"):
+            return self._forward_to_webui(self.path, "GET")
+
+        # ── /health → proxy to BFF ──
+        if path == "/health":
+            return self._forward_to_webui("/health", "GET")
+
+        # ── /upload, /webhook → proxy to BFF ──
+        if path in ("/upload", "/webhook"):
+            return self._forward_to_webui(self.path, "GET")
+
+        # ── /socket.io/* → proxy to BFF (WebSocket upgrade handled separately) ──
+        if path.startswith("/socket.io/"):
+            return self._forward_to_webui(self.path, "GET")
 
         self.send_error(404)