refactor: rename cli-v2 → cli, archive legacy cli, plus broker-side grants + auto-migrate

- apps/cli/ is now the canonical CLI (was apps/cli-v2/).
- apps/cli/ legacy v0 archived as branch 'legacy-cli-archive' and tag
  'cli-v0-legacy-final' before deletion; git history preserves it too.
- .github/workflows/release-cli.yml paths updated.
- pnpm-lock.yaml regenerated.

Broker-side peer-grant enforcement (spec: 2026-04-15-per-peer-capabilities):
- 0020_peer-grants.sql adds peer_grants jsonb + GIN index on mesh.member.
- handleSend in broker fetches recipient grant maps once per send, drops
  messages silently when sender lacks the required capability.
- POST /cli/mesh/:slug/grants to update from CLI; broker_messages_dropped_by_grant_total metric.
- CLI grant/revoke/block now mirror to broker via syncToBroker.

Auto-migrate on broker startup:
- apps/broker/src/migrate.ts runs drizzle migrate with pg_advisory_lock
  before the HTTP server binds. Exits non-zero on failure so Coolify
  healthcheck fails closed.
- Dockerfile copies packages/db/migrations into /app/migrations.
- postgres 3.4.5 added as direct broker dep.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/db/migrations/0020_peer-grants.sql

@@ -0,0 +1,27 @@
+-- Per-peer capability grants on mesh membership.
+--
+-- Spec: .artifacts/specs/2026-04-15-per-peer-capabilities.md
+--
+-- Adds a jsonb column to mesh_member tracking which peers may send what
+-- kind of messages to this member. Shape:
+--   { "<peer_pubkey_hex>": ["dm", "broadcast", "state-read", ...] }
+--
+-- Default = empty object, meaning "use the global default set"
+-- (read + dm + broadcast + state-read). Explicit empty array for a
+-- specific peer = blocked.
+--
+-- Enforcement lives in the broker's message router — before queueing an
+-- encrypted blob for a recipient, check peer_grants to see if the sender
+-- has the relevant capability. Silent drop on denial (Signal block
+-- semantics — sender's delivery receipt succeeds, recipient sees nothing).
+--
+-- Additive + nullable → safe to deploy before CLI knows about it.
+
+ALTER TABLE "mesh"."member"
+  ADD COLUMN IF NOT EXISTS "peer_grants" jsonb NOT NULL DEFAULT '{}'::jsonb;
+
+-- GIN index for fast existence checks: does this member have any grant
+-- entry for this sender pubkey? Used on every message-send hot path.
+CREATE INDEX IF NOT EXISTS "member_peer_grants_gin_idx"
+  ON "mesh"."member"
+  USING gin ("peer_grants");