feat(logging): add --debug global flag for enhanced CLI logging

[Copilot]

📥 Pull Request

✨ Description of new changes

Adds a --debug global flag that enables verbose debug logging to both console and log file. Debug logging activates when either the flag is passed OR debug_enabled config is true.

Changes

• fab_global_params.py: Added --debug flag to global parser options
• fab_logger.py:
  • Added set_verbose_enabled() and is_debug_enabled() functions
  • log_debug() now writes to console ([debug] prefix) and log file
  • All HTTP logging functions use unified is_debug_enabled() check
• main.py: Propagates --debug flag to logging system
• docs/essentials/settings.md: Added "Debug Logging" documentation section
• Tests: Added coverage for new debug flag functionality

Usage

# Per-command debug logging
fab ls / --debug

# Persistent debug logging via config
fab config set debug_enabled true

Output shows log file location and prefixes debug messages with [debug]:

! '--debug' is on (/home/user/.local/state/fabric-cli/log/fabcli_debug.log)
[debug] Error using encrypted cache: ...

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