feat: integrate angular-oauth2-oidc for authentication

- Added angular-oauth2-oidc package to package.json.
- Configured OAuth client in app.config.ts with resource server settings.
- Implemented login component with basic HTTP request to fetch products.
- Set up routing for the login component.
- Updated app component to initialize OAuth service and handle login.
- Modified default app settings to open and collapse sidenav by default.
- Removed placeholder content from app.html to streamline the initial view.

Web/package-lock.json

@@ -14,6 +14,7 @@
         "@angular/forms": "^20.0.0",
         "@angular/platform-browser": "^20.0.0",
         "@angular/router": "^20.0.0",
+        "angular-oauth2-oidc": "^20.0.2",
         "rxjs": "~7.8.0",
         "tslib": "^2.3.0"
       },
@@ -3374,6 +3375,19 @@
         }
       }
     },
+    "node_modules/angular-oauth2-oidc": {
+      "version": "20.0.2",
+      "resolved": "https://registry.npmjs.org/angular-oauth2-oidc/-/angular-oauth2-oidc-20.0.2.tgz",
+      "integrity": "sha512-bMSXEQIuvgq8yqnsIatZggAvCJvY+pm7G8MK0tWCHR93UpFuNN+L5B6pY9CzRg8Ys+VVhkLIBx4zEHbJnv9icg==",
+      "license": "MIT",
+      "dependencies": {
+        "tslib": "^2.5.2"
+      },
+      "peerDependencies": {
+        "@angular/common": ">=20.0.0",
+        "@angular/core": ">=20.0.0"
+      }
+    },
     "node_modules/ansi-escapes": {
       "version": "4.3.2",
       "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-4.3.2.tgz",