Reduce /api/tools server time: skip stale-sync on read, filter listOperations by integration

[amondnet]

Sub-task of #3 (Fix A).

toolsList runs syncStaleConnectionTools on every list call (2 unconditional D1 queries even when nothing changed): packages/core/sdk/src/executor.ts:2475 (call), :2438 (definition). listOperations also reads the entire plugin_storage operation set and filters in JS: packages/plugins/openapi/src/sdk/store.ts:150-156.

Tasks:

• Skip stale-sync on the read path when no integration has been revised (cache the check, or move sync to write-time / background).
• Filter listOperations by integration at the DB layer instead of scanning all rows.
• Narrow vitest run for the changed packages.

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