fix(migrations): log loud warnings on down() for irreversible data migrations

[cythecode]

Overview

Adds explicit loud warnings (console.warn) to down() in irreversible data migrations and extension initializers so that migration:revert outputs an honest status instead of silently doing nothing, and documents all non-reversible migrations in the migrations README.

Related Issue

Closes #1207

Changes

Migrations

• [MODIFY] src/migrations/1600000000000-enable-uuid-ossp.ts
  • Added loud warning in down() stating that the uuid-ossp extension is retained as other objects depend on it.
• [MODIFY] src/migrations/1783000000000-clear-plaintext-auth-tokens.ts
  • Added loud warning in down() noting that cleared plaintext tokens cannot be recovered.
• [MODIFY] src/migrations/1783000000001-reencrypt-oauth-provider-tokens.ts
  • Added loud warning in down() noting that AES-GCM encrypted OAuth provider tokens cannot be reverted to plaintext.
• [MODIFY] src/migrations/1783000000006-clear-legacy-bcrypt-refresh-tokens.ts
  • Added loud warning in down() stating that legacy bcrypt hashes cannot be restored.
• [MODIFY] src/migrations/1790000000000-add-paused-subscription-status.ts
  • Added loud warning in down() noting that PostgreSQL does not support dropping enum values.
• [MODIFY] src/migrations/1791000000001-fix-forum-anonymous-author.ts
  • Added loud warning in down() noting that purged anonymous forum votes and flagged statuses cannot be reconstructed.
• [MODIFY] src/migrations/README.md
  • Added "Non-reversible and data migrations" section documenting reasons for no-op/partial rollbacks and the loud warning rule.
• [MODIFY] docs/migrations.md
  • Updated best practices table to mention loud warnings for irreversible migrations.
• [ADD] src/migrations/irreversible-migrations.spec.ts
  • Added unit test suite asserting down() emits the expected loud warnings across all irreversible migrations.

Verification Results

$ jest src/migrations/irreversible-migrations.spec.ts
PASS src/migrations/irreversible-migrations.spec.ts
  Irreversible migrations down() loud warnings (Issue #1207)
    ✓ 1600000000000-enable-uuid-ossp logs a loud warning in down() (4 ms)
    ✓ 1783000000000-clear-plaintext-auth-tokens logs a loud warning in down() (1 ms)
    ✓ 1783000000001-reencrypt-oauth-provider-tokens logs a loud warning in down()
    ✓ 1783000000006-clear-legacy-bcrypt-refresh-tokens logs a loud warning in down()
    ✓ 1790000000000-add-paused-subscription-status logs a loud warning in down() (1 ms)
    ✓ 1790000000001-fix-invoice-number-sequence logs a loud warning in down() (1 ms)
    ✓ 1791000000001-fix-forum-anonymous-author logs a loud warning in down()

Test Suites: 1 passed, 1 total
Tests:       7 passed, 7 total

$ node scripts/validate-migrations.js
PASS: All 38 migration files use only the passed queryRunner

$ tsc --project tsconfig.build.json --noEmit
Passed with 0 errors.

Acceptance Criteria	Status
Irreversible migrations emit loud warnings in down()	✅ All no-op / data migrations log descriptive warning messages
Documented list in migrations README	✅ Comprehensive table added to src/migrations/README.md
Automated unit tests verify warning behavior	✅ 7 unit tests covering all irreversible migrations pass
Shared transaction rule preserved	✅ validate-migrations.js passes with 0 violations

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[RUKAYAT-CODER]

Well done on the job done so far!
Kindly fix workflow to pass