fix(auth): log real Firebase error + add NUXT_FIREBASE_API_KEY to docker-compose

app/server/api/auth/google.post.ts

@@ -23,10 +23,19 @@ export default defineEventHandler(async (event) => {
     throw createError({ statusCode: 500, message: 'Firebase API key not configured' })
   }
 
-  const verifyRes = await $fetch<any>(
-    `https://identitytoolkit.googleapis.com/v1/accounts:lookup?key=${apiKey}`,
-    { method: 'POST', body: { idToken } }
-  ).catch(() => null)
+  console.log('[Auth] Received idToken, length:', idToken?.length || 0)
+  console.log('[Auth] Using API key (masked):', apiKey ? `${apiKey.slice(0, 6)}...${apiKey.slice(-4)}` : 'EMPTY')
+
+  let verifyRes: any
+  try {
+    verifyRes = await $fetch<any>(
+      `https://identitytoolkit.googleapis.com/v1/accounts:lookup?key=${apiKey}`,
+      { method: 'POST', body: { idToken } }
+    )
+  } catch (err: any) {
+    console.error('[Auth] Firebase token verification failed:', err?.data || err?.message || err)
+    throw createError({ statusCode: 401, message: 'Invalid Firebase token' })
+  }
 
   if (!verifyRes?.users?.[0]) {
     throw createError({ statusCode: 401, message: 'Invalid Firebase token' })