feat: geocode performance

[joaquimds]

No description provided.

[Copilot]

Pull request overview

This PR introduces a dedicated read-replica database connection for expensive geocode lookups and tweaks default map configuration for an example organisation map.

Changes:

• Add a second Kysely instance (dbRead) backed by a read-replica pg pool, sharing the existing plugin stack.
• Switch the expensive findAreasByPoint query to use the read replica while keeping other queries on the primary.
• Update the example organisation map view to use a default calculation type and explicitly enable the choropleth layer.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/server/services/database/index.ts	Defines a read-replica Pool, corresponding PostgresDialect, shared plugin list, and exports a new dbRead Kysely instance alongside the existing db.
src/server/repositories/Area.ts	Updates findAreasByPoint to run against dbRead instead of db to offload this heavy spatial read from the primary.
src/server/commands/ensureOrganisationMap.ts	Uses DEFAULT_CALCULATION_TYPE for the map view’s calculationType and explicitly sets showChoropleth: true in the created example view config.

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