feat(rook): build registry services for account, pool, route, and settings

[yacosta738]

Summary

Implements #584 — registry services for the Rook local-first provider gateway.

What changed

• SqliteAccountService — CRUD for ProviderAccount wired to the correct db layer methods (insert_account, get_account, delete_account). Update = delete + insert (db layer has no update_* ops).
• SqlitePoolService — CRUD for ProviderPool including member management (add_pool_member, remove_pool_member). Pool delete and update via raw sqlx::query since the db layer has no delete_pool.
• SqliteRouteService — CRUD for ModelRoute with model-based lookup (find_route_by_model). Update = delete + insert.
• SettingsService trait — async trait with InMemorySettingsService and SqliteSettingsService; backed by a single-row upsert pattern.
• db/settings.rs — load_settings / save_settings helpers.
• migrations/0002_settings.sql — settings table (single-row enforced via WHERE id = 1).
• RookRegistry — uses concrete types (not dyn Trait) to stay compatible with RPITIT async traits (Rust 1.75+, no async_trait). Exposes typed accessors for all four services.
• domain/mod.rs — added RookSettings struct with a sensible Default.

Design decisions

• No async_trait — RPITIT traits (fn foo(&self) -> impl Future<Output = T> + Send) are not dyn-compatible, so RookRegistry holds concrete Sqlite*Service types. This avoids vtable overhead and the async_trait macro entirely.
• Update = delete + insert — the existing db layer has no update_* methods; this keeps the service layer honest about what the db actually supports.

Test results

83/84 tests pass. The 1 failure (db::account::tests::vendor_other_with_quotes_round_trips) is a pre-existing bug in quote-escaping for ProviderVendor::Other — unrelated to this PR.

Close #584

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📥 Commits

Reviewing files that changed from the base of the PR and between c6d1b82 and 9bc818e.

📒 Files selected for processing (11)

• clients/rook/migrations/0002_settings.sql
• clients/rook/src/db/mod.rs
• clients/rook/src/db/settings.rs
• clients/rook/src/domain/mod.rs
• clients/rook/src/registry/mod.rs
• clients/rook/src/services/account.rs
• clients/rook/src/services/health.rs
• clients/rook/src/services/mod.rs
• clients/rook/src/services/pool.rs
• clients/rook/src/services/route.rs
• clients/rook/src/services/settings.rs

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• Create PR with unit tests
• Commit unit tests in branch feat/rook-584-registry-services

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