Update from code changes: document Postgres wire protocol endpoint

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Summary

Adds a new integration reference page documenting the experimental Postgres wire protocol endpoint that exposes the Lightdash semantic layer to any standard Postgres client, and covers the new project settings page that org admins use to opt in and grab connection snippets.

Changes

• New page references/integrations/postgres-wire-protocol.mdx covering:
  • What the endpoint is and typical use cases.
  • Enterprise/license gating via PGWIRE_PORT (with optional PGWIRE_HOST), plus the per-organization opt-in from Project settings → Semantic layer and inline token generation.
  • Connecting with psql, connection URLs, and JDBC using service account or personal access tokens (with sslmode=disable).
  • Explore → table / field-id → column mapping.
  • Supported and unsupported SQL, information_schema discovery, and error codes (28P01, 3D000, 0A000).
• Registered the new page in the Integrations group in docs.json.

Context

Follows the source PRs that introduced this endpoint, moved it to the enterprise codebase with service-account auth, and added the project settings page:

• feat: postgres wire protocol endpoint for the semantic layer lightdash#25269
• feat: move postgres wire endpoint to EE and support service accounts lightdash#25282
• feat: add project settings page for semantic layer pgwire connection lightdash#25480

Update history

• Initial page: documented the endpoint, enterprise/license gating via PGWIRE_PORT, connection via psql with service account or PAT, field mapping, supported/unsupported SQL, and error codes — covering feat: postgres wire protocol endpoint for the semantic layer lightdash#25269 and feat: move postgres wire endpoint to EE and support service accounts lightdash#25282.
• Follow-up: added the Project settings → Semantic layer opt-in flow, the optional PGWIRE_HOST env var, the org-admin-only connection details and inline token generation, and connection URL / JDBC examples with sslmode=disable — covering feat: add project settings page for semantic layer pgwire connection lightdash#25480.

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[mintlify]

Update from code changes updated this PR.

Documented the new project settings page for opting into the Postgres wire endpoint and grabbing ready-to-copy connection snippets.

Source PRs

• lightdash/lightdash#25269 — feat: postgres wire protocol endpoint for the semantic layer
• lightdash/lightdash#25282 — feat: move postgres wire endpoint to EE and support service accounts
• lightdash/lightdash#25480 — feat: add project settings page for semantic layer pgwire connection