fix(app): print the startup line only when app.py runs as a script

The "Starting app on host:port" line sat at module level, so every
import printed it, including the test suites and any WSGI server that
loads the module; CodeQL reported it as a print during import. It now
lives in the __main__ block, which the Docker CMD and the e2e runner
reach through python app.py; the e2e Flask log still shows the line.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

app/app.py

@@ -28,7 +28,6 @@ logging.basicConfig(level=logging.DEBUG)
 FLASK_ENV = os.getenv("FLASK_ENV", "production")
 FLASK_HOST = os.getenv("FLASK_HOST", "127.0.0.1")
 FLASK_PORT = int(os.getenv("FLASK_PORT", os.getenv("PORT", 5000)))
-print(f"Starting app on {FLASK_HOST}:{FLASK_PORT}, FLASK_ENV={FLASK_ENV}")
 
 # Initialize the CacheManager
 cache_manager = CacheManager()
@@ -190,6 +189,7 @@ def localized_index(lang):
 
 
 if __name__ == "__main__":
+    print(f"Starting app on {FLASK_HOST}:{FLASK_PORT}, FLASK_ENV={FLASK_ENV}")
     app.run(
         debug=(FLASK_ENV == "development"),
         host=FLASK_HOST,