chore+feat: add whitelist and blacklist filtering to GET /files endpoint

[LevinCeglie]

Also autohide CANCELED files by default and implement UI/UX for filtering in CLI and frontend.

--

• should probably add filtering options to frontend as well at some point

[greptile-apps]

Greptile Summary

This PR adds file-state filtering across the API, CLI, and frontend. The main changes are:

• Adds include and exclude state filters to GET /files.
• Sends multiple states as repeated query parameters.
• Adds state-filtering options to the CLI.
• Hides canceled files by default in file listings.

Confidence Score: 5/5

This looks safe to merge.

• Multiple states are now sent as repeated query parameters.
• The DTO accepts both single and repeated state values.
• The backend receives arrays compatible with its IN and NOT IN predicates.
• No blocking issues remain in the changed code.

Important Files Changed

Filename	Overview
frontend/src/services/queries/file.ts	Serializes each state as a repeated query parameter and forwards the filters through mission file queries.
packages/api-dto/src/types/file/file-query.dto.ts	Normalizes single and repeated state parameters into validated FileState arrays.
backend/src/services/file-query.service.ts	Applies state whitelists and blacklists with parameterized SQL predicates.
cli/kleinkram/api/routes.py	Adds state lists to the CLI request parameters using the existing repeated-parameter encoding.
frontend/src/components/explorer-page/explorer-page-files-table.vue	Excludes canceled files from the explorer table by default.

_{Reviews (2): Last reviewed commit: "fix(frontend): fix file state filter par..." | Re-trigger Greptile}