Replace the curl-based Taskfile download task with a Go binary that
concurrently fetches datastar.js, datastar.js.map, daisyui.mjs, and
daisyui-theme.mjs. Update vendored libs to latest versions.
Add config package with build-tag-switched dev/prod environments,
structured logging via zerolog, Taskfile for dev workflow, golangci-lint
config, testutil package, and improved DB setup with proper SQLite
pragmas and cleanup. Rename sqlc output package from gen to repository.
Switch to allowlist .gitignore, Alpine+UPX+scratch Dockerfile, and
CI pipeline with test/lint gates before deploy.
