revert: remove PWA functionality due to service worker issues

The PWA implementation was causing too many issues:
- Service worker conflicts with CSP policies
- 429 rate limiting errors
- Application freezing
- External resource blocking

Removed:
- service-worker.js
- manifest.json
- offline.html
- PWA service and install component
- PWA meta tags from index.html
- PWA asset configuration

The library now functions as a standard web app without PWA features.
This provides a more stable and reliable user experience.

apps/frontend/project.json

@@ -19,21 +19,6 @@
           {
             "glob": "**/*",
             "input": "apps/frontend/public"
-          },
-          {
-            "glob": "manifest.json",
-            "input": "apps/frontend/src",
-            "output": "/"
-          },
-          {
-            "glob": "service-worker.js",
-            "input": "apps/frontend/src",
-            "output": "/"
-          },
-          {
-            "glob": "offline.html",
-            "input": "apps/frontend/src",
-            "output": "/"
           }
         ],
         "styles": ["apps/frontend/src/styles.scss"]