Refactor application structure to use WorkspaceService for state management

- Removed direct state management from components and centralized it in WorkspaceService.
- Updated ApartmentsPage, TenantsPage, LeasesPage, and DashboardPage to utilize WorkspaceService for data handling.
- Introduced SessionService to manage user session state and authentication.
- Simplified component templates to reflect new service-based architecture.
- Removed unused ConfigService and its tests.
- Added lease.html template for lease document generation.
- Created app.routes.spec.ts for route mapping tests.

frontend/src/app/components/settings-page/settings-page.html

@@ -21,8 +21,8 @@
     <mat-radio-group
       class="theme-options"
       aria-label="Thème de l'application"
-      [value]="themePreference()"
-      (change)="themePreferenceChanged.emit($event.value)"
+      [value]="theme.preference()"
+      (change)="theme.setPreference($event.value)"
     >
       <mat-radio-button value="light"
         ><span class="theme-option-copy"
@@ -60,10 +60,10 @@
     </div>
     <div class="session-action">
       <div>
-        <strong>{{ username() }}</strong
-        ><span>{{ email() }}</span>
+        <strong>{{ session.username() }}</strong
+        ><span>{{ session.email() }}</span>
       </div>
-      <button mat-stroked-button type="button" (click)="logoutRequested.emit()">Déconnexion</button>
+      <button mat-stroked-button type="button" (click)="logout()">Déconnexion</button>
     </div>
   </article>
 </section>

frontend/src/app/components/settings-page/settings-page.ts

@@ -1,7 +1,8 @@
-import { Component, input, output } from '@angular/core';
+import { Component, inject } from '@angular/core';
 import { MatButtonModule } from '@angular/material/button';
 import { MatRadioModule } from '@angular/material/radio';
-import { ThemePreference } from '../../services/theme.service';
+import { SessionService } from '../../services/session.service';
+import { ThemeService } from '../../services/theme.service';
 
 @Component({
   selector: 'app-settings-page',
@@ -10,9 +11,8 @@ import { ThemePreference } from '../../services/theme.service';
   styleUrl: './settings-page.css',
 })
 export class SettingsPage {
-  readonly username = input.required<string>();
-  readonly email = input.required<string>();
-  readonly themePreference = input.required<ThemePreference>();
-  readonly themePreferenceChanged = output<ThemePreference>();
-  readonly logoutRequested = output<void>();
+  readonly session = inject(SessionService);
+  readonly theme = inject(ThemeService);
+
+  logout(): void { window.location.href = '/logout'; }
 }