use offline sqlx by default

[dhth]

Make SQLx offline mode the default for normal development checks while isolating live schema operations in dedicated tasks.

Remote development environments previously had to build and install sqlx-cli before running the standard check suite. This made provisioning slow even though the repository already commits SQLx query metadata.

Formatting, linting, building, and testing now compile against committed metadata in offline mode. sqlx:prepare regenerates metadata against a migrated test database, while sqlx:prepare-check validates it. CI runs the validation task explicitly.

This separates routine development from live schema validation while preserving offline-build coverage and protection against stale query metadata.

[dhth]

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📝 Walkthrough

Walkthrough

SQLx runs in offline mode by default. The aggregate mise task no longer prepares the test database. A new sqlx:online-checks task creates the database, applies migrations, and validates SQLx metadata with online access. The main and pull request workflows invoke this task during testing. The locked setup no longer installs cargo:sqlx-cli.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly summarizes the main change: making SQLx offline mode the default.
Description check	✅ Passed	The description accurately explains the offline default, dedicated online checks, and CI validation changes.

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