test(03-01): add TablosDeps stub and RED integration test scaffold for TABLO-01..06
- handlers_tablos.go: TablosDeps stub type enabling test compilation
- handlers_tablos_test.go: 10 integration tests (RED baseline) for all TABLO-01..06 paths
- TestTabloList, TestTabloList_Empty, TestTabloCreate, TestTabloCreate_Validation
- TestTabloDetail_Owner, TestTabloDetail_NonOwner, TestTabloDetail_InvalidID
- TestTabloUpdate, TestTabloDeleteConfirm, TestTabloDelete
- router.go: NewRouter accepts TablosDeps as second deps parameter
- handlers_auth_test.go, handlers_test.go, csrf_test.go: update NewRouter call sites
- cmd/web/main.go: construct and pass TablosDeps to NewRouter
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