fix: failing tests and resolve test suite

Description

This merge request fixes multiple inconsistencies between test cases and the actual application schemas, validators, and fixtures.

A total of 33 failing tests across 7 test files were resolved by aligning test expectations with the current implementation.

Key Fixes:

• Schema Alignment

  • Updated incorrect field names (place → current_place, added username)
  • Removed references to non-existent fields (corrections_made, correction_type)
  • Fixed invalid enum/type values (e.g., "Picture" → "image")

• Validation Fixes

  • Corrected test data to meet validator requirements (e.g., descriptions ≥10 words)
  • Updated whitespace and newline constraints to match actual limits
  • Fixed language codes ("hindi" → "hi")

• Return Type Fixes

  • Adjusted assertions to match actual return types (string vs date object)

• OCR Segment Fixes

  • Corrected reading_order logic (must start at 0 and be sequential)
  • Updated regex expectations for error messages

• Fixtures & Imports

  • Removed invalid imports (CorrectionEntry)
  • Added missing fixtures (admin_token_headers, user_token_headers, test_category)

• Test Data Refactor

  • Centralized and corrected test data to ensure consistency across tests

Root Cause Summary:

• Schema field mismatches
• Validator threshold mismatches
• Incorrect assumptions in test assertions
• Invalid test data
• Missing fixtures/imports

Result:

• ✅ 33 failures → 0 failures
• ✅ All 435 tests passing or correctly skipped
• ✅ Improved test reliability and maintainability

---

Checklist

• The bug has been reproduced and confirmed
• A clear and concise fix has been implemented
• New/updated tests prevent regressions
• All existing tests are passing

---

Related Issue(s)

Closes #108 (closed)

---