feat: add DaisyUI v5 theming, PKCE auth, and Keycloak realm export

- Add DaisyUI v5 with custom certifai-dark/certifai-light themes using oklch colors
- Create styles/input.css as Tailwind + DaisyUI entry point (replaces root tailwind.css)
- Add SVG brand logo combining shield motif with neural network nodes
- Implement PKCE (S256) for OAuth authorization code flow
- Add Keycloak realm-export.json with test users for local development
- Fix CSS load order in app.rs (tailwind before main.css) and add data-theme attribute

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

package.json

@@ -0,0 +1,16 @@
+{
+  "name": "certifai",
+  "module": "index.ts",
+  "type": "module",
+  "private": true,
+  "devDependencies": {
+    "@types/bun": "latest"
+  },
+  "peerDependencies": {
+    "typescript": "^5"
+  },
+  "dependencies": {
+    "daisyui": "^5.5.18",
+    "tailwindcss": "^4.1.18"
+  }
+}