feat: versionamento visível (rodapé + /api/version + carimbo no build)

- backend: endpoint GET /api/version + linha [VERSION] no boot (le APP_VERSION/GIT_COMMIT/BUILD_TIME/APP_ENV)
- frontend: buildInfo.ts le import.meta.env.VITE_* ; versão no rodapé do Sidebar
- Dockerfiles (front+back): ARG/ENV do carimbo de versão
- docker-compose.yml: build args (APP_VERSION/GIT_COMMIT/BUILD_TIME/APP_ENV) com defaults
- bump V1.0.12 -> V1.0.13

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/server.js

@@ -171,6 +171,16 @@ app.use(cors({
 // --- HEALTH CHECK ---
 app.get('/api/ping', (req, res) => res.json({ status: 'ok', ts: new Date().toISOString() }));
 
+// --- VERSION / BUILD INFO (carimbado no build via ARGs do Dockerfile) ---
+const BUILD_INFO = {
+    name: 'ScoreOdonto API',
+    version: process.env.APP_VERSION || 'dev',
+    commit: process.env.GIT_COMMIT || 'dev',
+    build: process.env.BUILD_TIME || '',
+    environment: (process.env.APP_ENV || 'DEV').toUpperCase(),
+};
+app.get('/api/version', (req, res) => res.json(BUILD_INFO));
+
 // =============================================================================
 // SECURITY MIDDLEWARE: Tenant Guard
 // =============================================================================
@@ -7985,6 +7995,7 @@ app.post('/api/admin/repasses/:id/confirmar', adminGuard, async (req, res) => {
 
 const httpServer = app.listen(PORT, '0.0.0.0', async () => {
     console.log(`[SERVER] Running on http://0.0.0.0:${PORT}`);
+    console.log(`[VERSION] ${BUILD_INFO.name} ${BUILD_INFO.version} · commit ${BUILD_INFO.commit} · build ${BUILD_INFO.build || 'n/a'} · ${BUILD_INFO.environment}`);
     await loadGoogleCredsFromDb();
     await runMigrations();
     await seedContratoModelos();