feat(ccli): add CcliPasteController endpoints
- POST /api/ccli/preview: parse-only endpoint (no DB writes)
- POST /api/songs/import-from-ccli-paste: 3 modes (create / pair-with-song / assign-to-service-song)
- GET /songs/import-from-ccli-paste: Inertia page with base64 bookmarklet prefill
- Routes guarded by auth:sanctum + throttle:30,1 (API); auth + web stack (web)
- Maps DuplicateCcliSongException to 409 with existing_song_id and edit_url
- Pest tests (10 cases, 63 assertions): preview, all 3 import modes, 409 dup, 422 errors, unauth, prefill happy/error, login redirect
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