fix(deps): upgrade ajv from v6 to v8 to resolve ReDoS vulnerability

[cryptodev-2s]

Summary

• Upgrade ajv from ^6.10.0 to ^8.18.0 to fix moderate severity ReDoS vulnerability GHSA-2g4f-4pwh-qvx6
• Add ajv-formats@^3.0.1 (formats were extracted to a separate package in v8)
• Update type imports and test mocks for v8 compatibility

Changes

File	Change
package.json	ajv ^6.10.0 → ^8.18.0, add ajv-formats
validate-open-rpc-document.ts	Add addFormats(), set strict: false (needed for draft-07 style additionalItems in @json-schema-tools/meta-schema)
method-call-validator.ts	Update Ajv as IAjv → Ajv (v8 type export), add addFormats()
parameter-validation-error.test.ts	dataPath → instancePath in mock ErrorObject

Breaking change

ErrorObject.dataPath was renamed to ErrorObject.instancePath in ajv v8. Downstream code accessing error object properties directly will need to update.

Test plan

• All 79 unit tests pass
• TypeScript compiles clean
• Webpack web build succeeds
• 100% line coverage maintained

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (de3dca3) to head (cfc719b).
⚠️ Report is 14 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #977   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           16        16           
  Lines          528       532    +4     
  Branches       136       136           
=========================================
+ Hits           528       532    +4     

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