csm-portal backend: time-card create + update passthrough

[rksk]

What

Adds BFF passthrough endpoints for time-card writes, alongside the existing POST /time-cards/search:

• POST /time-cards — create.
• PATCH /time-cards/{id} — update. The body carries either editable fields, or a state transition: {"state":"approved"} or {"state":"rejected","leadComment":"..."}.

Both are thin auth-checked passthroughs to the entity service (raw JSON body forwarded; UUID path param validated for the PATCH). Authorization is enforced downstream.

Layers

Entity client methods, handler interface + handlers, routes, openapi.yaml (paths + schemas), test mock, and handler tests. go build, go test clean.

Depends on

The entity-service time-card write endpoints (#989) — this BFF forwards to them.

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Review details

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📥 Commits

Reviewing files that changed from the base of the PR and between 193bbc1 and cee7476.

📒 Files selected for processing (6)

• apps/csm-portal/backend/cmd/server/main.go
• apps/csm-portal/backend/internal/entity/entity.go
• apps/csm-portal/backend/internal/handler/helpers_test.go
• apps/csm-portal/backend/internal/handler/time_cards.go
• apps/csm-portal/backend/internal/handler/time_cards_test.go
• apps/csm-portal/backend/openapi.yaml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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