feat: add postgres support to switch between databases and schemas

[json-nan]

Summary

Adds support to change between databases and schemas using postgres engine

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[datlechin]

@json-nan Hi, please resolve conflict

[json-nan]

@datlechin check again please

[Copilot]

Pull request overview

Adds PostgreSQL support for switching databases (via reconnect) and schemas (via search_path/driver schema switch) from the Cmd+K switcher, updating UI/state handling and documentation accordingly.

Changes:

• Add a Postgres “Databases / Schemas” mode toggle to the database switcher and wire schema-selection callback.
• Update Postgres switching behavior to reconnect the session when changing databases; add a dedicated switchSchema path.
• Refresh docs, localization catalog entries, and changelog to reflect the new switching behavior.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
docs/vi/databases/postgresql.mdx	Updates Vietnamese Postgres switching docs from schema-only to database switching.
docs/databases/postgresql.mdx	Updates English Postgres switching docs; now describes database switching.
TablePro/Views/Toolbar/ConnectionStatusView.swift	Simplifies help text to always show “Current database …” for Cmd+K switching.
TablePro/Views/MainContentView.swift	Passes active database + schema into switcher and adds schema-selection callback.
TablePro/Views/Main/Extensions/MainContentCoordinator+URLFilter.swift	Routes URL-driven “schema” selection to schema switch for Postgres, database switch otherwise.
TablePro/Views/Main/Extensions/MainContentCoordinator+Navigation.swift	Implements Postgres DB switching via session reconnect; adds switchSchema(to:).
TablePro/Views/DatabaseSwitcher/DatabaseSwitcherSheet.swift	Adds segmented toggle for Postgres and routes selection to DB vs schema callback.
TablePro/ViewModels/DatabaseSwitcherViewModel.swift	Introduces Mode (database/schema) and adjusts fetching/preselection logic.
TablePro/Resources/Localizable.xcstrings	Removes “Current schema …” strings and adds new switcher/alert strings.
TablePro/Models/ConnectionToolbarState.swift	For Postgres, prefers showing session.currentDatabase instead of schema.
CHANGELOG.md	Notes updated Postgres Cmd+K switcher behavior.

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[datlechin]

Hi @json-nan check the Copilot's reviews :d

[json-nan]

@datlechin changes implemented, check again please