diff --git a/data/wiki/guanghan_topology_demo.html b/data/wiki/guanghan_topology_demo.html
index 0fa4df0..7574ebd 100644
--- a/data/wiki/guanghan_topology_demo.html
+++ b/data/wiki/guanghan_topology_demo.html
@@ -255,7 +255,7 @@
 </div>
 
 <script>
-const API_BASE = 'http://localhost:5000';
+const API_BASE = '';
 let currentData = null;
 
 // Group node members for composite SVG elements
diff --git a/tests/test_topology_api.py b/tests/test_topology_api.py
new file mode 100644
index 0000000..bb4a8b3
--- /dev/null
+++ b/tests/test_topology_api.py
@@ -0,0 +1,45 @@
+from __future__ import annotations
+
+import unittest
+from pathlib import Path
+
+from topology_api.app import create_app
+
+
+ROOT = Path(__file__).resolve().parents[1]
+HTML_PATH = ROOT / "data" / "wiki" / "guanghan_topology_demo.html"
+CONFIG_PATH = ROOT / "topology_api" / "config.py"
+
+
+class TopologyApiServingTests(unittest.TestCase):
+    @classmethod
+    def setUpClass(cls) -> None:
+        app = create_app()
+        app.config.update(TESTING=True)
+        cls.client = app.test_client()
+
+    def test_app_serves_demo_page_and_health(self) -> None:
+        health = self.client.get("/health")
+        self.assertEqual(health.status_code, 200)
+        self.assertEqual(health.get_json(), {"status": "ok"})
+
+        page = self.client.get("/guanghan_topology_demo.html")
+        self.assertEqual(page.status_code, 200)
+        self.assertIn("广寒基地拓扑结构", page.get_data(as_text=True))
+        page.close()
+
+    def test_page_uses_same_origin_api(self) -> None:
+        html = HTML_PATH.read_text(encoding="utf-8")
+        self.assertNotIn("http://localhost:5000", html)
+        self.assertIn("const API_BASE = ''", html)
+
+    def test_config_has_no_default_password(self) -> None:
+        source = CONFIG_PATH.read_text(encoding="utf-8")
+        self.assertNotRegex(
+            source,
+            r'os\.environ\.get\(\s*["\']PGPASSWORD["\']\s*,',
+        )
+
+
+if __name__ == "__main__":
+    unittest.main()
diff --git a/topology_api/app.py b/topology_api/app.py
index 855a507..163c54f 100644
--- a/topology_api/app.py
+++ b/topology_api/app.py
@@ -1,10 +1,15 @@
 # topology_api/app.py
-from flask import Flask
+from pathlib import Path
+
+from flask import Flask, send_from_directory
 from flask_cors import CORS
 from topology_api.config import API_HOST, API_PORT, API_DEBUG
 from topology_api.routes.snapshot import snapshot_bp
 
 
+WIKI_DIR = Path(__file__).resolve().parents[1] / "data" / "wiki"
+
+
 def create_app():
     app = Flask(__name__)
     CORS(app)
@@ -14,6 +19,10 @@ def create_app():
     def health():
         return {"status": "ok"}
 
+    @app.route("/guanghan_topology_demo.html")
+    def topology_demo():
+        return send_from_directory(WIKI_DIR, "guanghan_topology_demo.html")
+
     return app
 
 
diff --git a/topology_api/config.py b/topology_api/config.py
index 7b43c0f..4dc8906 100644
--- a/topology_api/config.py
+++ b/topology_api/config.py
@@ -1,11 +1,18 @@
 # topology_api/config.py
 import os
+from pathlib import Path
+
+from dotenv import load_dotenv
+
+
+PROJECT_ROOT = Path(__file__).resolve().parents[1]
+load_dotenv(PROJECT_ROOT / ".env")
 
 # PostgreSQL connection (from .env)
-PGHOST = os.environ.get("PGHOST", "192.168.195.241")
-PGPORT = os.environ.get("PGPORT", "35432")
-PGUSER = os.environ.get("PGUSER", "user_armor")
-PGPASSWORD = os.environ.get("PGPASSWORD", "user_armor_1790990971")
+PGHOST = os.environ["PGHOST"]
+PGPORT = os.environ["PGPORT"]
+PGUSER = os.environ["PGUSER"]
+PGPASSWORD = os.environ["PGPASSWORD"]
 TOPO_DATABASE = os.environ.get("TOPO_DATABASE", "ksp_wiki_topology")
 
 _BASE_DSN = f"postgresql://{PGUSER}:{PGPASSWORD}@{PGHOST}:{PGPORT}"
@@ -26,5 +33,5 @@ WRITER_DATABASE_URL = os.environ.get(
 )
 
 API_HOST = os.environ.get("TOPOLOGY_API_HOST", "0.0.0.0")
-API_PORT = int(os.environ.get("TOPOLOGY_API_PORT", "5000"))
+API_PORT = int(os.environ.get("TOPOLOGY_API_PORT", "8080"))
 API_DEBUG = os.environ.get("TOPOLOGY_API_DEBUG", "false").lower() == "true"