Add comprehensive logged events documentation for management-api

[Copilot]

The management-api lacked documentation of its logged events, making monitoring setup and debugging inefficient.

Changes

• Added LOGGED_EVENTS.md: Comprehensive reference documenting all 350 unique log events across 9 source files, organized by file and log level (Info/Warn/Error/Debug) with source line numbers
• Updated README.md: Added link to logged events documentation
• Updated .gitignore: Added patterns for compiled service binaries

Documentation Structure

Events are categorized by source file and log level for quick reference:

## management-auth.go

### Info Events
- `sign in with an existing management user` (line 98)
- `sign up with a new management user` (line 81)
- `got renew token` (line 235)

### Warn Events
- `instance not allowed` (line 59)
- `user not allowed to get renew token` (line 230)

### Error Events
- `could not create new user` (line 93)
- `failed to bind request` (line 53)

Each event includes its source line number and contextual logging attributes (instanceID, userID, studyKey, etc.) are documented for log aggregation and filtering.

The documentation was auto-generated from source code to ensure accuracy and completeness.

Original prompt

provide a list of all possible logged events in the management-api,

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