Chore/phase 1 cleanup

[Aditya2550]

Phase 1 cleanup done

[Copilot]

Pull request overview

This PR performs a “phase 1 cleanup” by removing the backend’s mock AI-related modules/services and wiring in basic HTTP performance/security middleware (compression + rate limiting) at the app level.

Changes:

• Removed AI module routing/controllers/models and related mock services (smart approval path + risk scoring).
• Removed an old SQL migration (001_init_users.sql) in favor of the newer schema approach.
• Added compression and express-rate-limit to the backend and enabled them in backend/src/app.js.

Reviewed changes

Copilot reviewed 10 out of 12 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
backend/src/services/smartApproval.service.js	Removes mock smart-approval path helper.
backend/src/services/riskScoring.service.js	Removes mock expense risk scoring helper.
backend/src/services/ocr.service.js	Removes mock OCR receipt parsing service implementation.
backend/src/routes/index.js	Removes /ai route registration.
backend/src/modules/ai/ai.routes.js	Deletes AI routing module.
backend/src/modules/ai/ai.model.js	Deletes AI model stub.
backend/src/modules/ai/ai.controller.js	Deletes AI controller.
backend/src/db/migrations/001_init_users.sql	Deletes legacy user/company schema migration.
backend/src/app.js	Adds compression + rate limiting middleware.
backend/package.json	Adds compression and express-rate-limit dependencies.
backend/package-lock.json	Locks new dependency tree for added middleware packages.

Files not reviewed (1)

• backend/package-lock.json: Generated file

Comments suppressed due to low confidence (1)

backend/src/services/ocr.service.js:1

• parseReceiptWithOcr is still imported and used by the expenses module (e.g., backend/src/modules/expenses/expenses.controller.js), but this PR removes the implementation from ocr.service.js. That will cause a runtime/module resolution (or missing export) failure when starting the backend or calling /expenses/ocr. Either keep this service (even as a stub) or remove/update the expenses OCR endpoint and its import.

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