Move work-items project access check to router-level middleware

[ponbac]

Problem

ensure_user_has_project_access(...) is called manually in each work-items handler that receives organization + project.

Current duplicates in toki-api/src/routes/work_items/mod.rs:

• get_iterations (:142)
• get_board (:157)
• format_for_llm (:179)
• get_image (:199)
• move_work_item (:243)

This repeats authorization logic and increases the chance of missing the check on future endpoints.

Requested change

Move the work-items project access check to router level and remove these per-handler calls:

ensure_user_has_project_access(&app_state, &user, &body.organization, &body.project).await?;

(and equivalent query-based variants).

Scope

• Add a router-level guard/middleware for work-item routes that require organization and project.
• Apply it to:
  • GET /work-items/iterations
  • GET /work-items/board
  • GET /work-items/image
  • GET /work-items/format-for-llm
  • POST /work-items/move
• Keep GET /work-items/projects unguarded (it is used to resolve allowed projects).
• Remove handler-level ensure_user_has_project_access(...) calls from the routes above.

Acceptance criteria

• Authorization behavior remains unchanged for allowed/forbidden users.
• Work-items handlers no longer contain duplicated access-check calls.
• Router wiring in work_items::router() clearly shows where access enforcement happens.
• Add/update tests covering guard behavior for at least one query-based and one body-based route.

[ponbac]

@codex start work on this.

[chatgpt-codex-connector]

Summary

• Added a router-level project-access guard middleware (work_item_project_access_guard) and wired it to the project-scoped work-item routes (/iterations, /board, /image, /format-for-llm, /move) while keeping /projects unguarded, so the router clearly owns authorization enforcement. toki-api/src/routes/work_items/mod.rsL386-L414 toki-api/src/routes/work_items/mod.rsL691-L703
• Removed duplicated per-handler access checks from the guarded handlers; handlers now focus on route logic while authorization is centralized. toki-api/src/routes/work_items/mod.rsL143-L155 toki-api/src/routes/work_items/mod.rsL157-L176 toki-api/src/routes/work_items/mod.rsL178-L195 toki-api/src/routes/work_items/mod.rsL197-L230 toki-api/src/routes/work_items/mod.rsL241-L261
• Added reusable scope/access helpers for query/body extraction and case-insensitive access matching, used by the middleware and existing access-check flow. toki-api/src/routes/work_items/mod.rsL333-L384
• Added tests covering one query-based route scope extraction path, one body-based extraction path, and access-matching behavior. toki-api/src/routes/work_items/mod.rsL731-L778

Testing

• ✅ curl -s https://docs.rs/axum/latest/axum/middleware/fn.from_fn.html | head -n 5
• ✅ cd /workspace/toki2/toki-api && cargo fmt --all && SQLX_OFFLINE=true cargo test routes::work_items::tests -- --nocapture

Committed on current branch:

• d82be84

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