feat: Durable Objects, vectorize metering, remote MCP server

[hellno]

Summary

Brings over all non-template work from the claude/remote-mcp-architecture-6vJdG branch. Excludes template deletions (tanstack-ai, telegram-bot, cron changes kept as-is on main).

Durable Objects support

• DO metering, enforcement, auto-fix prerequisites (nodejs_compat, migrations)
• Export validation before deploy, dispatch hints
• Resource tracking in control plane
• Control plane migrations (0028, 0029)

Vectorize direct metering

• Code injection replaces proxy handler
• Remove vectorize proxy from binding-proxy-worker
• Remove jack-vectorize.ts wrapper from semantic-search template

Remote MCP server (new: apps/mcp-worker)

• OAuth 2.1 authentication
• Tools: deploy-code, deploy-template, database, logs, projects, rollback, source

CLI improvements

• jack down --force with full teardown + delete_project MCP tool
• JSONC helper dedup (jsonc-edit.ts extracted from 3 files)
• Auto-trigger login in authFetch
• DO config auto-fix + export validator with tests
• Zip packager utility

Control plane

• DO metering wrapper + enforcement on delete/rollback
• Fix duplicate module upload breaking DO deployments
• Vectorize-usage API endpoint

Other

• Install script (curl-based onboarding)
• Docs updates (getting-started, ai-agents, quickstart)

Test plan

• bun test — 319 tests pass
• Deploy control plane with new migrations
• Test DO project deploy end-to-end
• Test vectorize metering without proxy
• Verify MCP worker OAuth flow