feat: personal access tokens with scoped bearer auth

Add cnp_ personal access tokens so the CLI, MCP server, and external
agents authenticate without a browser session — the agent-first spine
from ROADMAP2 phase A. Modeled on agent_auth_tokens: raw token shown
once, only SHA-256 hash stored.

- user_tokens table (goose migration + sqlc), name/prefix/scope/expiry,
  owner-scoped revoke, last_used_at stamping
- middleware: cnp_ bearer resolution, read scope gates mutations with
  403 SCOPE_INSUFFICIENT, non-admin scopes cap is_admin even for admin
  owners — a token never outranks its scope or its owner
- GET/POST/DELETE /api/v1/user/tokens + OpenAPI + generated types
- Settings UI: create with scope/expiry pickers, one-time token display
  with copy, list with last-used/expiry, confirm-revoke
- docs: OPERATIONS.md section, README feature line

Verified end-to-end against live Postgres: create/list/revoke, read
scope blocks PUT (403), write PAT on admin owner blocked from admin
routes (403), admin scope works, revoked token returns 401.

Authored By: TDvorak <[email protected]>

README.md

@@ -56,7 +56,7 @@ dedicated console.
 - **Template catalog** — 30 official templates (NocoDB, Plausible, MinIO, n8n, …) plus user-defined templates with JSON upload and owner-scoped edit/delete
 - **Metrics** — per-service Docker stats plus host CPU/memory/disk telemetry
 - **HA & scaling** — failover policies, node agents, autoscaling rules
-- **Auth & security** — Better Auth sessions (email/password self-hosted), audit logs, vulnerability scans
+- **Auth & security** — Better Auth sessions (email/password self-hosted), personal access tokens with `read`/`write`/`admin` scopes for CLI and agents, audit logs, vulnerability scans
 - **Integrated docs** — searchable documentation rendered in-app on the landing page and `/docs`; syncs from GitHub, falls back to a bundled snapshot offline
 - **Networking** — Traefik reverse proxy, optional Cloudflare Tunnel