Add symlink directory for easy log access

[Bruce1102]

Creates flat directory with symlinks to Hydra's timestamped logs for easier tailing, searching, and monitoring.

Example:

cli_log_links/
  ├── cli_20260213_104733.log -> ../outputs/hostname_cli/2026-02-13/10-47-33/csp-gateway.log
  ├── cli_20260213_105000.log -> ../outputs/hostname_cli/2026-02-13/10-50-00/csp-gateway.log
  ├── cli_20260213_121921.log -> ../outputs/hostname_cli/2026-02-13/12-19-21/csp-gateway.log
  └── latest.log -> ../outputs/hostname_cli/2026-02-13/12-19-21/csp-gateway.log

Changes

• Add SymlinkFileHandler extending logging.FileHandler
• Creates {job_name}_log_links/ with timestamped symlinks + latest.log
• Update Hydra logging config to use new handler

Notes:

• Symlinks created on handler init, no runtime overhead
• Failures logged but non-fatal - actual logs unaffected
• latest.log always points to current(which is the newest) running instance, updated atomically on new runs
• Directory name configurable via hydra.job.name for multi-instance deployments
• No changes to existing log files in outputs/

[codecov]

Codecov Report

❌ Patch coverage is 89.58333% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.88%. Comparing base (d9abe73) to head (8de32f8).

Files with missing lines	Patch %	Lines
csp_gateway/server/shared/symlink_file_handler.py	70.58%	8 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #217      +/-   ##
==========================================
+ Coverage   84.84%   84.88%   +0.03%     
==========================================
  Files         126      128       +2     
  Lines       11891    11987      +96     
  Branches     1194     1196       +2     
==========================================
+ Hits        10089    10175      +86     
- Misses       1448     1456       +8     
- Partials      354      356       +2     

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