fix(F5): remove misplaced imports and align TS types with backend models

[Copilot]

Foundations review (F5) — clean up import hygiene across the stack and fix a type contract mismatch between the frontend and backend.

Changes

Unused import removed

• agent/scan.py: dropped import sys (never referenced)

In-function imports promoted to module level

• backend/routers/scan.py: get_scan was imported inside the route handler on every request
• backend/repository.py: datetime / timezone were imported inside update_scan_finished

TypeScript ↔ Pydantic contract fixed

frontend/src/types/api.ts import request interfaces had field names that didn't match the backend models:

// Before — mismatched with Pydantic
interface ImportCertRequest   { pem: string }
interface ImportSshRequest    { pubkey: string }
interface ImportConfigRequest { content: string; filename: string }

// After — aligned with backend/models.py
interface ImportCertRequest   { pem_content: string }
interface ImportSshRequest    { pubkey_content: string }
interface ImportConfigRequest { config_type: 'sshd' | 'openssl'; config_content: string }

[Copilot]

Pull request overview

This PR performs small cross-stack hygiene fixes by removing/moving misplaced imports in Python modules and correcting a frontend TypeScript ↔ backend Pydantic request-shape mismatch for import endpoints.

Changes:

• Promotes in-function Python imports to module scope (router/repository) and removes an unused import in the agent CLI.
• Updates Import*Request TypeScript interfaces to match backend Import*Payload field names and shapes.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
frontend/src/types/api.ts	Aligns import request interfaces (ImportCertRequest, ImportSshRequest, ImportConfigRequest) with backend Pydantic payload models.
backend/routers/scan.py	Moves get_scan repository import to module level (aliased to avoid name clash with route handler).
backend/repository.py	Moves datetime/timezone import to module level for update_scan_finished.
agent/scan.py	Removes unused sys import from the agent CLI entrypoint.