Disable auth rate limiters in debug mode for UI test suites

Rate limiters on login/register/password-reset endpoints cause 429 errors
when running parallel UI tests that create many accounts. In debug mode,
skip rate limiters entirely so test suites can run without throttling.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docker-compose.dev.yml

@@ -55,6 +55,7 @@ services:
       # Server
       PORT: "8000"
       DEBUG: "true"
+      DEBUG_FIXED_CODES: "true"
       ALLOWED_HOSTS: "localhost,127.0.0.1"
       TIMEZONE: "${TIMEZONE:-UTC}"
 
@@ -121,7 +122,7 @@ services:
       api:
         condition: service_healthy
     healthcheck:
-      test: ["CMD", "wget", "--no-verbose", "--tries=1", "--spider", "http://127.0.0.1:3000/admin/"]
+      test: ["CMD", "wget", "--no-verbose", "--tries=1", "--spider", "http://127.0.0.1:3000/"]
       interval: 30s
       timeout: 10s
       retries: 3