feat: add deprecation warnings for external file path references in config handlers

[ankita10119]

🔧 Changes

Added deprecation warnings across all config file loading paths to notify customers ahead of a planned breaking change (tracked in #1388) that will remove support for absolute paths and paths resolving outside the config root directory.

Affected locations:

• src/context/directory/index.ts - loadFile fallback when relative path cannot be resolved
• src/context/yaml/index.ts - same for YAML context
• src/context/directory/handlers/actions.ts - action code path resolved via fs.existsSync as an absolute/external path
• src/context/directory/handlers/actionModules.ts - same for action modules
• src/context/directory/handlers/databases.ts - customScripts path resolving outside the config root

Existing behavior is fully preserved - files still load successfully. A warn-level log is emitted to prompt customers to migrate to relative paths before the breaking change lands.

📚 References

• fix: prevent path traversal in config file handlers #1388 (breaking change deferred to a future major version)

🔬 Testing

No new unit tests added as behavior is unchanged. Warnings can be verified manually by referencing a file outside the config directory in any of the affected asset types (actions, action modules, databases, pages) - a deprecation warn log is emitted and the file continues to load normally.

All 1231 existing tests pass with no regressions.

📝 Checklist

• All new/changed/fixed functionality is covered by tests (or N/A)
• I have added documentation for all new/changed functionality (or N/A)

[codecov-commenter]

Codecov Report

❌ Patch coverage is 70.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.85%. Comparing base (0326e38) to head (6e382c8).

Files with missing lines	Patch %	Lines
src/context/directory/handlers/databases.ts	66.66%	1 Missing and 1 partial ⚠️
src/context/directory/handlers/actionModules.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1392      +/-   ##
==========================================
- Coverage   79.86%   79.85%   -0.02%     
==========================================
  Files         153      153              
  Lines        7064     7072       +8     
  Branches     1550     1551       +1     
==========================================
+ Hits         5642     5647       +5     
- Misses        781      783       +2     
- Partials      641      642       +1     

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[kushalshit27]

Please keep it simple.

Support for absolute paths and paths outside the config root will be deprecated in a future version to improve the security of the tool.` 
+
`Please update your configuration to use paths relative to the config directory.`
+ 
"Current absolute paths used are [path1, path2]"