feat: implement forgot password and reset password frontend

- Add ForgotPassword page with email submission form
- Add ResetPassword page with token validation and new password form
- Extend AuthContext with requestPasswordReset and resetPassword functions
- Add routes for /forgot-password and /reset-password in App.tsx
- Update Login page to link to forgot password flow instead of showing alert

Implements Fase 1 of frontend missing features analysis

frontend/src/pages/Login.tsx

@@ -58,14 +58,9 @@ export function Login() {
               <div className="space-y-2">
                 <div className="flex items-center justify-between">
                   <Label htmlFor="password">Password</Label>
-                  <Link 
-                    to="#" 
+                  <Link
+                    to="/forgot-password"
                     className="text-sm text-primary hover:underline"
-                    onClick={(e) => {
-                      e.preventDefault();
-                      // TODO: Implement forgot password
-                      alert('Forgot password - Coming soon');
-                    }}
                   >
                     Forgot password?
                   </Link>