fix: backend type errors, re-enable excluded sources, drop build artifacts

[miss-yusrah]

closes #953
closes #956
closes #959
closes #964

Summary

• Fix TypeScript narrowing bugs in Rust validation and Express query/param handling across controllers and routes
• Re-enable typechecking for previously excluded backend sources (search, canvas, courses, freelance, BFF, mock subscriptions)
• Remove ~1.1MB+ of committed build/compiler scratch files and tighten .gitignore

Task 1 — rust-validation.ts

• Removed @ts-nocheck
• Narrowed line[columnIndex] with a default (?? '') before property-key use
• Added safe defaults for pairs[opener.char] so string | undefined never flows into PropertyKey / string slots

Task 2 — Express string | string[] | undefined safety

• Added shared helpers in backend/src/utils/queryParams.ts (getQueryString, getQueryInt, getQueryBoolean)
• Applied them in:
  • hash.controller.ts
  • p2p.controller.ts
  • voting.controller.ts
  • license.routes.ts
  • explorer.routes.ts
  • simulatorErrors.routes.ts
• Removed @ts-nocheck from all of the above
• Runtime behavior preserved (same defaults / validation paths)

Task 3 — Excluded backend files

Removed from tsconfig.json exclude (fixed and typechecked):

1. src/routes/courses.ts
2. src/routes/freelance.ts
3. src/services/bff.service.ts
4. src/routes/subscriptions.ts
5. src/routes/canvas.routes.ts
6. src/routes/search/**/*
7. src/search/**/*

Notable fixes:

• Search: Zod 4 z.record(key, value), ZodError.issues, filter/in typing, pagination nextCursor, sort field narrowing
• Canvas: JSON collaborators helpers, required collaborators: [] on create, param narrowing
• Courses: stable CourseView mapping for Prisma nullables / extra fields

Still excluded (temporary @ts-nocheck + follow-up needed):

• subscription.controller.ts
• subscriptions.routes.ts
• subscription.service.ts
• middleware/auth.ts

These still depend on Prisma models (User, Subscription, SubscriptionPlan, etc.) that are not in schema.prisma.

Task 4 — Cleanup build artifacts

Removed tracked scratch files including:

• contracts/check_output*.json, contracts/errors*.json, contracts/test_output.txt, contracts/check_errors.txt
• backend/build*.log, backend/ts_errors.txt, backend/test_output.log, root build.log

Updated .gitignore for *.log, contracts/check_output*.json, contracts/errors*.json, and related test/compiler outputs. No CI references to these files were found.

Test plan

• cd backend && npx tsc -p tsconfig.json --noEmit (task files should be clean; preexisting unrelated errors may remain)
• Spot-check license/explorer/p2p/voting/hash query routes still accept normal query strings
• Confirm canvas create/list and course CRUD still respond as before
• Confirm CI does not require the deleted contract/build log files

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[ayomideadeniran]

pr under review