Add runtime feature flag to control whether request bodies are stored
in logs. The Handler now accepts a Redis client to check the
log_request_body_enabled feature flag before persisting log records.
- Add logRequestBodyFeatureKey constant for feature flag
- Inject Redis client into Handler for feature flag lookups
- Strip request body from log records when feature is disabled
- Update tests to pass Redis client to NewHandler
Standardize alignment of struct tags in models and field assignments in
services for better readability. Additionally, include the Binding model
in the test database auto-migration.
