Scott/chart drop meilisearch

[binaryknot]

Remove Meilisearch from the lago chart

Meilisearch is fully decommissioned across Lago (workers, server, PVCs, IAM, DNS, Zitadel OIDC — all torn down) and removed from lago-infrastructure and lago-deploy. This strips the last of it from the chart, including the global.meilisearch env-projection integration wired through the config and rails subcharts.

Changes

• lago-config — drop the meilisearch.endpoint ConfigMap key and meilisearch.apiKey Secret key, plus the global.meilisearch values block.
• lago-rails — drop the LAGO_MEILISEARCH_URL / LAGO_MEILISEARCH_SEARCH_ENABLED / LAGO_MEILISEARCH_API_KEY env projection, the global.meilisearch values block, and the meilisearch_search_enabled unit test.
• lago-pdf — drop the global.meilisearch values block.
• lago (umbrella) — drop the meilisearch-worker dependency (Chart.yaml + Chart.lock), the sidekiq.queues.meilisearch toggle, the global.meilisearch block, the meilisearch-worker overrides, and the README references.

Validation

helm lint passes. Unit tests pass: 63 in lago-config/lago-rails, 61 in the umbrella chart (deps rebuilt). Templates render with zero Meilisearch references and no nil-pointer, including with global.sidekiq.queues.meilisearch=true forced. Template consumers and their values were removed together so absent global.meilisearch can't error.

Chart version bump is left to the standard lockstep release chore (mirroring how the worker was originally added).