feat: tools return in the TOON format instead of JSON.

[lipka28]

This unifies the behavior across the mcp tools to always return in TOON format instead of JSON for reduced token use. The main changes are mostly in database_tools.py and tools_manager.py. The other changes are:

• Make all the affected tests expect a TOON formated string as a result.
• Variable name consistency (variable containing TOON formated string shouldn't be called result_json)
• Inline documentation fixes for some functions which specify returning JSON which is no longer true after this change.

[snyk-io]

✅ Snyk checks have passed. No issues have been found so far.

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✅	Open Source Security	0	0	0	0	0 issues
✅	Licenses	0	0	0	0	0 issues
✅	Code Security	0	0	0	0	0 issues

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 66.66667% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 51.45%. Comparing base (bef5536) to head (24bd7cb).
⚠️ Report is 32 commits behind head on main.

Files with missing lines	Patch %	Lines
tools/database_tools.py	66.66%	1 Missing ⚠️
tools/tools_manager.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #40      +/-   ##
==========================================
+ Coverage   47.54%   51.45%   +3.90%     
==========================================
  Files          27       38      +11     
  Lines        1424     2859    +1435     
  Branches      178      391     +213     
==========================================
+ Hits          677     1471     +794     
- Misses        724     1326     +602     
- Partials       23       62      +39     

Flag	Coverage Δ
unit-tests	51.45% <66.66%> (+3.90%)	⬆️

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[lipka28]

/ok-to-test

[flacatus]

/ok-to-test