Backport PgClient.fromPool

[tim-smart]

Adds PgClient.fromPool + PgClient.layerFromPool (ported from effect v4) so callers can build a PgClient from an externally-managed pg.Pool.

Also updates span attributes to use the derived connection config (so db.namespace / server.address are correct when connecting via url), and fixes workspace typechecking for pg-based test fixtures by declaring pg / @types/pg in the relevant packages.

Validation:

• pnpm lint-fix OK
• pnpm check OK
• pnpm build OK
• pnpm docgen OK
• pnpm test run packages/sql-pg/test/Client.test.ts requires a container runtime (testcontainers) and fails in this environment

[changeset-bot]

🦋 Changeset detected

Latest commit: b035382

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 7 packages

Name	Type
@effect/sql-pg	Patch
@effect/cluster	Patch
@effect/sql-drizzle	Patch
@effect/platform-bun	Patch
@effect/platform-node-shared	Patch
@effect/platform-node	Patch
@effect/sql-clickhouse	Patch

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