refactor: migrate configuration system from JSON Schema to QuickType

[fabiovincenzi]

Replace JSON-Schema for config validation and default injection
Add typed config export, loadConfig(), validate() and setConfigFile()
Update index.ts to use the new loader and pass the validated config.

---

Note: Restored from deleted fork

This PR recreates the original PR #998, which was automatically closed due to accidental fork deletion.

** For discussions and reviews:** See the original PR #998

All commits are identical to the original with preserved git history.

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[codecov]

Codecov Report

❌ Patch coverage is 81.27660% with 44 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.39%. Comparing base (94d807d) to head (794dfae).

Files with missing lines	Patch %	Lines
src/config/index.ts	82.03%	7 Missing and 16 partials ⚠️
src/config/generated/config.ts	80.00%	13 Missing and 4 partials ⚠️
src/config/ConfigLoader.ts	87.50%	0 Missing and 2 partials ⚠️
src/proxy/index.ts	0.00%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1140      +/-   ##
==========================================
+ Coverage   82.83%   83.39%   +0.56%     
==========================================
  Files          66       67       +1     
  Lines        2784     2878      +94     
  Branches      334      367      +33     
==========================================
+ Hits         2306     2400      +94     
+ Misses        431      419      -12     
- Partials       47       59      +12     

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[linux-foundation-easycla]

• ✅ login: fabiovincenzi / name: Fabio Vincenzi (a865d65, 29d4562, 9758a5b, 5a4e068, 80f2736, 0acdd16, 0fe5e0a, 04d912e, 1eaff43, 29b26a3, 2fb1f3c, 1a0e295, fa83356, c08da33, 499570c, 7642274, 5f7aace, cec5819, 0f2fde7, ba40989, 795dc45, 098db65, 0262b61, b53f096, 794dfae, b96ee9f, a2b8968, 6f84652, 4a9f533)
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