Add webhook feature

[sigitosh]

Webhook Notification Feature

Adds webhook notifications when files are successfully renamed. External systems can now be notified via HTTP POST containing the renamed file path.

Key Features

• Configurable webhook URL in namer.cfg
• Simple enable/disable toggle
• Error handling to prevent interruption of renaming workflow

Configuration

[webhook]
webhook_enabled = True
webhook_url = http://mediaserver/xyz

Includes full test coverage for all scenarios.

[codecov]

Codecov Report

Attention: Patch coverage is 95.83333% with 3 lines in your changes missing coverage. Please review.

Project coverage is 85.10%. Comparing base (77994aa) to head (c78f5a4).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
test/namer_webhook_test.py	94.54%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #272      +/-   ##
==========================================
+ Coverage   84.91%   85.10%   +0.18%     
==========================================
  Files          40       41       +1     
  Lines        4647     4719      +72     
  Branches      522      525       +3     
==========================================
+ Hits         3946     4016      +70     
- Misses        421      422       +1     
- Partials      280      281       +1     

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