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/contexts/AuthContext.tsx

@@ -23,6 +23,8 @@ interface AuthContextType {
   login: (email: string, password: string) => Promise<boolean>;
   logout: () => void;
   register: (email: string, password: string, fullName: string) => Promise<boolean>;
+  requestPasswordReset: (email: string) => Promise<boolean>;
+  resetPassword: (token: string, newPassword: string) => Promise<boolean>;
 }
 
 const AuthContext = createContext<AuthContextType | undefined>(undefined);
@@ -151,13 +153,58 @@ export function AuthProvider({ children }: { children: React.ReactNode }) {
     localStorage.removeItem(REFRESH_TOKEN_KEY);
     localStorage.removeItem(USER_KEY);
     delete api.defaults.headers.common['Authorization'];
-    
-    showToast({ 
-      title: 'Logged out', 
-      description: 'See you soon!' 
+
+    showToast({
+      title: 'Logged out',
+      description: 'See you soon!'
     });
   }, []);
 
+  const requestPasswordReset = useCallback(async (email: string): Promise<boolean> => {
+    try {
+      await api.post('/auth/reset-password-request', { email });
+
+      showToast({
+        title: 'Reset email sent',
+        description: 'Check your email for password reset instructions'
+      });
+
+      return true;
+    } catch (error: any) {
+      const message = error.response?.data?.detail || 'Failed to send reset email';
+      showToast({
+        title: 'Request failed',
+        description: message,
+        variant: 'destructive'
+      });
+      return false;
+    }
+  }, []);
+
+  const resetPassword = useCallback(async (token: string, newPassword: string): Promise<boolean> => {
+    try {
+      await api.post('/auth/reset-password', {
+        token,
+        new_password: newPassword
+      });
+
+      showToast({
+        title: 'Password reset successful',
+        description: 'You can now log in with your new password'
+      });
+
+      return true;
+    } catch (error: any) {
+      const message = error.response?.data?.detail || 'Failed to reset password';
+      showToast({
+        title: 'Reset failed',
+        description: message,
+        variant: 'destructive'
+      });
+      return false;
+    }
+  }, []);
+
   return (
     <AuthContext.Provider value={{
       user,
@@ -166,6 +213,8 @@ export function AuthProvider({ children }: { children: React.ReactNode }) {
       login,
       logout,
       register,
+      requestPasswordReset,
+      resetPassword,
     }}>
       {children}
     </AuthContext.Provider>