feat(vendor): replace CDN dependencies with local npm packages

Introduces a vendor build pipeline so all third-party browser assets
(Bootstrap, Bootstrap Icons, Font Awesome, marked, jQuery) are served
from local static files instead of external CDNs.

- Add app/package.json with vendor deps and postinstall/build scripts
- Add app/scripts/copy-vendor.js to copy assets to static/vendor/
- Update base.html.j2 to use url_for('static', ...) for all vendor assets
- Update Dockerfile to install Node.js/npm and run npm install
- Update .gitignore to exclude app/node_modules/ and app/static/vendor/

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/package.json

@@ -1,5 +1,16 @@
 {
+  "dependencies": {
+    "@fortawesome/fontawesome-free": "^6.7.2",
+    "bootstrap": "5.2.2",
+    "bootstrap-icons": "1.9.1",
+    "jquery": "3.6.0",
+    "marked": "^4.3.0"
+  },
   "devDependencies": {
     "cypress": "^14.5.1"
+  },
+  "scripts": {
+    "build": "node scripts/copy-vendor.js",
+    "postinstall": "node scripts/copy-vendor.js"
   }
 }

app/scripts/copy-vendor.js

@@ -0,0 +1,71 @@
+'use strict';
+/**
+ * Copies third-party browser assets from node_modules into static/vendor/
+ * so Flask can serve them without any CDN dependency.
+ * Runs automatically via the "postinstall" npm hook.
+ */
+const fs   = require('fs');
+const path = require('path');
+
+const NM     = path.join(__dirname, '..', 'node_modules');
+const VENDOR = path.join(__dirname, '..', 'static', 'vendor');
+
+function copyFile(src, dest) {
+  fs.mkdirSync(path.dirname(dest), { recursive: true });
+  fs.copyFileSync(src, dest);
+}
+
+function copyDir(src, dest) {
+  fs.mkdirSync(dest, { recursive: true });
+  for (const entry of fs.readdirSync(src, { withFileTypes: true })) {
+    const s = path.join(src, entry.name);
+    const d = path.join(dest, entry.name);
+    entry.isDirectory() ? copyDir(s, d) : fs.copyFileSync(s, d);
+  }
+}
+
+// Bootstrap CSS + JS bundle
+copyFile(
+  path.join(NM, 'bootstrap', 'dist', 'css', 'bootstrap.min.css'),
+  path.join(VENDOR, 'bootstrap', 'css', 'bootstrap.min.css')
+);
+copyFile(
+  path.join(NM, 'bootstrap', 'dist', 'js', 'bootstrap.bundle.min.js'),
+  path.join(VENDOR, 'bootstrap', 'js', 'bootstrap.bundle.min.js')
+);
+
+// Bootstrap Icons CSS + embedded fonts
+copyFile(
+  path.join(NM, 'bootstrap-icons', 'font', 'bootstrap-icons.css'),
+  path.join(VENDOR, 'bootstrap-icons', 'font', 'bootstrap-icons.css')
+);
+copyDir(
+  path.join(NM, 'bootstrap-icons', 'font', 'fonts'),
+  path.join(VENDOR, 'bootstrap-icons', 'font', 'fonts')
+);
+
+// Font Awesome Free CSS + webfonts
+copyFile(
+  path.join(NM, '@fortawesome', 'fontawesome-free', 'css', 'all.min.css'),
+  path.join(VENDOR, 'fontawesome', 'css', 'all.min.css')
+);
+copyDir(
+  path.join(NM, '@fortawesome', 'fontawesome-free', 'webfonts'),
+  path.join(VENDOR, 'fontawesome', 'webfonts')
+);
+
+// marked – browser UMD build (path varies by version)
+const markedCandidates = [
+  path.join(NM, 'marked', 'marked.min.js'),              // v4.x
+  path.join(NM, 'marked', 'lib', 'marked.umd.min.js'),   // v5.x
+  path.join(NM, 'marked', 'dist', 'marked.min.js'),      // v9+
+];
+const markedSrc = markedCandidates.find(p => fs.existsSync(p));
+if (!markedSrc) throw new Error('marked: no browser UMD build found in node_modules');
+copyFile(markedSrc, path.join(VENDOR, 'marked', 'marked.min.js'));
+
+// jQuery
+copyFile(
+  path.join(NM, 'jquery', 'dist', 'jquery.min.js'),
+  path.join(VENDOR, 'jquery', 'jquery.min.js')
+);

app/templates/moduls/base.html.j2

@@ -9,22 +9,19 @@
             href="{% if platform.favicon.cache %}{{ url_for('static', filename=platform.favicon.cache) }}{% endif %}"
         >
         <!-- Bootstrap CSS only -->
-        <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.2.2/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-Zenh87qX5JnK2Jl0vWa8Ck2rdkQ2Bzep5IDxbcnCeuOxjzrPF/et3URy9Bv1WTRi" crossorigin="anonymous">
+        <link href="{{ url_for('static', filename='vendor/bootstrap/css/bootstrap.min.css') }}" rel="stylesheet">
         <!-- Bootstrap JavaScript Bundle with Popper -->
-        <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.2.2/dist/js/bootstrap.bundle.min.js" integrity="sha384-OERcA2EqjJCMA+/3y+gxIOqMEjwtxJY7qPCqsdltbNJuaOe923+mo//f6V8Qbsw3" crossorigin="anonymous"></script>
+        <script src="{{ url_for('static', filename='vendor/bootstrap/js/bootstrap.bundle.min.js') }}"></script>
         <!-- Bootstrap Icons -->
-        <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap-icons@1.9.1/font/bootstrap-icons.css">
+        <link rel="stylesheet" href="{{ url_for('static', filename='vendor/bootstrap-icons/font/bootstrap-icons.css') }}">
         <!-- Fontawesome -->
-        <script src="https://kit.fontawesome.com/56f96da298.js" crossorigin="anonymous"></script>
+        <link rel="stylesheet" href="{{ url_for('static', filename='vendor/fontawesome/css/all.min.css') }}">
         <!-- Markdown -->
-        <script src="https://cdn.jsdelivr.net/npm/marked/marked.min.js"></script>
+        <script src="{{ url_for('static', filename='vendor/marked/marked.min.js') }}"></script>
         <link rel="stylesheet" href="{{ url_for('static', filename='css/default.css') }}">
         <link rel="stylesheet" href="{{ url_for('static', filename='css/custom_scrollbar.css') }}">
         <!-- JQuery -->
-        <script
-        src="https://code.jquery.com/jquery-3.6.0.min.js"
-        crossorigin="anonymous">
-        </script>
+        <script src="{{ url_for('static', filename='vendor/jquery/jquery.min.js') }}"></script>
     </head>
     <body
       {% if apod_bg %}