Adds bin/cli/runtime/sqliteRuntime.mjs that resolves better-sqlite3 from:
(1) bundled optionalDependency, (2) ~/.omniroute/runtime/ install,
(3) lazy npm install into runtime dir, (4) node:sqlite stdlib (Node >=22.5),
(5) bundled sql.js WASM. Each native binary is validated against expected
platform magic bytes (ELF/Mach-O/PE) before load.
Adds bin/cli/runtime/magicBytes.mjs with validateBinaryMagic() helper
(9 tests). Adds bin/cli/runtime/index.mjs as warmUpRuntimes() orchestrator.
Adds scripts/postinstall.mjs warm-up hook (non-fatal, skipped in CI).
Integrates it as the last step of scripts/build/postinstall.mjs.
Extends src/lib/db/core.ts with ensureDbInitialized() (async, idempotent)
and getDriverInfo() so the startup orchestrator can await the resolver
before any DB access, enabling graceful degradation without crashing the
process on missing better-sqlite3.
Solves Windows EBUSY error on 'npm install -g omniroute@latest' while the
previous version is still running, and works in environments without C++
build tools or with unreachable npm registry.
Documents OMNIROUTE_SKIP_POSTINSTALL in .env.example and ENVIRONMENT.md.
Ref: 9router/cli/hooks/sqliteRuntime.js (pattern origin).
