feat: Complete Azure SSO implementation (v0.1.3)

- Add SSO session cleanup task (10-min expiry, 60s purge interval)
- Change callback to redirect to frontend with tokens as query params
- Add sso_callback_url to SecurityConfig with serde default
- Add SsoCallbackPage.tsx for handling SSO callback redirects
- Add /auth/sso/callback public route to App.tsx
- Add Sign in with Microsoft Azure button to LoginPage
- Replace insecure decode_jwt_payload with verify_id_token
- Implement JWKS caching (1-hour TTL) and RSA signature verification
- Validate iss, aud, exp claims on id_token
- Add jsonwebtoken dependency to pm-web crate
- Update config.example.toml with sso_callback_url setting
- Add sso_callback_url to settings response (read-only from TOML)

frontend/src/components/AppLayout.tsx

@@ -139,7 +139,7 @@ export default function AppLayout() {
       <Divider />
       <Box sx={{ p: 1.5 }}>
         <Typography variant="caption" color="text.secondary">
-          Linux Patch Manager v0.1.0
+           Linux Patch Manager v0.1.3
         </Typography>
       </Box>
     </Box>