refactor(main): modularize runtime and harden anilist setup flow

docs/file-size-budgets.md

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+# File Size Budgets
+
+Purpose: keep large modules from becoming maintenance bottlenecks.
+
+## Current Budget
+
+- TypeScript source files in `src/` and `launcher/`
+- Soft budget: `500` LOC
+- Excludes generated bundle artifacts (for example `subminer`)
+
+## Commands
+
+- Warning mode (non-blocking): `bun run check:file-budgets`
+- Strict mode (CI/local gate): `bun run check:file-budgets:strict`
+- Custom limit: `bun run scripts/check-file-budgets.ts --limit 650`
+
+## Policy
+
+- If file exceeds budget, prefer extracting domain module(s) first.
+- Keep composition/orchestration files focused on wiring.
+- Do not hand-edit generated artifacts; refactor source modules.