Audit an Application's Configuration Surface for Unsafe Defaults and Undocumented Settings

Audit the configuration surface of this application. I'll paste config files, environment variable reads, default values from code, and any existing config documentation.

Produce a table of every setting with these columns: name, where it is read, default value, what it controls, whether it is documented, and whether it is safe to leave unset in production.

Then report on:
1. **Unsafe defaults**: settings whose default is fine for local development but risky in production (debug modes, permissive CORS, disabled TLS verification, verbose logging of request bodies, wildcard hosts, default credentials, generous timeouts or no timeout at all).
2. **Silent fallbacks**: places where a missing or misspelled setting falls back to a default without any warning. Suggest which should fail at startup instead.
3. **Undocumented settings**: anything read in code but absent from the docs, and anything documented but no longer read.
4. **Conflicts and precedence**: where the same value can come from a file, an environment variable, and a flag, and whether the precedence order is clear and tested.
5. **Secrets handling**: settings that hold secrets and whether they could end up in logs, error messages, or a config dump endpoint.
6. **Validation gaps**: settings that accept any string where a type, range, or enum is expected.

For each finding give: the setting, evidence from what I pasted, the failure it could cause, and a specific fix. Separate confirmed issues from things you suspect but cannot verify from the input. Do not invent settings that were not in the material.

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