🐛 fix(auth): implement password reset email link handler

- Add GET /api/auth/reset-password/:token endpoint to handle email links
- Create password-reset-redirect store to track source app URLs
- Include callbackURL in reset emails for proper app redirection
- Add redirectTo parameter to forgotPassword in shared-auth
- Create /reset-password page in calendar app with DE/EN translations
- Update calendar authStore with resetPasswordWithToken method

Fixes 404 error when clicking password reset link from email

packages/shared-auth/src/core/authService.ts

@@ -181,13 +181,15 @@ export function createAuthService(config: AuthServiceConfig) {
 
 		/**
 		 * Send password reset email
+		 * @param email - User's email address
+		 * @param redirectTo - Optional URL to redirect after password reset (current app origin)
 		 */
-		async forgotPassword(email: string): Promise<AuthResult> {
+		async forgotPassword(email: string, redirectTo?: string): Promise<AuthResult> {
 			try {
 				const response = await fetch(`${baseUrl}${endpoints.forgotPassword}`, {
 					method: 'POST',
 					headers: { 'Content-Type': 'application/json' },
-					body: JSON.stringify({ email }),
+					body: JSON.stringify({ email, redirectTo }),
 				});
 
 				if (!response.ok) {