feat(configuration): add request timing log

One INFO line per API request: method, handler pattern, status, ms.
No ids or query strings in the line. Refs #40.

readme.md

@@ -477,6 +477,13 @@ openssl pkey -in private.pem -outform DER | base64 -w0   # JWT_PRIVATE_KEY
 openssl pkey -in private.pem -pubout -outform DER | base64 -w0   # JWT_PUBLIC_KEY
 ```
 
+### Request timing log
+
+`RequestTimingFilter` writes one INFO line to stdout per API request: method, handler path pattern, status and
+duration, e.g. `GET /api/users/me 200 12 ms`. The pattern is `-` when no handler matched (e.g. a `401` before
+routing). The line never holds ids, query strings, user data or tokens. `/actuator/**` is skipped. An exception
+that leaves the filter chain is logged as `500`.
+
 ## Tests
 
 ```bash