Consistency in acceptable length of Tool Names

[MohanLaksh]

• Bug Fix: Fixes issue [Bug]: Inconsistency in acceptable length of Tool Names for tools created via UI and programmatically #631 .
  🐞 Bug Summary
  Inconsistency in acceptable tool name length for tools created via UI and via cURL command
  Tool Names for tools created on UI are restricted to 100 characters.
  Whereas, the tool names of tools created via cURL command can have up to 255 characters.

[crivetimihai]

Summary:
This PR makes the maximum allowed name length for input validation configurable via a settings value instead of being hardcoded (previously 100). It passes the value from the backend (Python/FastAPI) through the template into JavaScript as window.MAX_NAME_LENGTH, and updates error messages accordingly.

Issues:

• No obvious issues with logic or security.
• Make sure settings.validation_max_name_length is always set and numeric to avoid JS errors.
• If not already tested, verify the new limit propagates correctly in all relevant UI interactions.

Passed: make lint-web doctest test

[MohanLaksh]

PR Self Review Summary:

1. make lint-web - success (found 0 vulnerabilities)
2. make serve - working as intended
3. make test - passed (80%, == 1127 passed, 10 skipped, 50 warnings in 46.06s ==)
4. make autoflake isort black flake8 - 137 files left unchanged.
5. make pylint - pass (Your code has been rated at 10.00/10 )
6. make smoketest - ✅ Smoketest passed!
7. make doctest - pass (58%, 372 passed, 8 skipped in 21.33s)