feat(services): traefik routing overrides via allowlisted middleware labels (#64)

services.traefik_labels (jsonb) holds operator-defined Traefik
middlewares keyed 'middlewares.<name>.<type>[.<field>]', validated
against an allowlist at write time. edgeLabels (extracted from
createReplica) scopes each definition to the service router as
<router>-<name> and auto-attaches it to the router's middleware chain
after builtins. Router/service/provider-level keys are rejected.

Surfaces: create/update API fields, services create/update
--traefik-label (repeatable, key=value), MCP arg docs, OpenAPI +
regenerated types, service-page Access editor (Routing overrides
card + textarea).

Also marks three stale ROADMAP2 items shipped: notification producers
round-out, build-on-node (PR #60), mobile env/domains/scaling (PR #61).

Generated with [Devin](https://devin.ai)

Co-authored-by: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

app/backend/migrations_goose/20261113000000_service_traefik_labels.sql

@@ -0,0 +1,9 @@
+-- +goose Up
+-- Routing overrides: per-service Traefik middleware definitions stored as
+-- { "middlewares.<name>.<type>.<field>": "value" }. Validated against an
+-- allowlist; applied to the service's router and auto-attached to its
+-- middleware chain at reconcile time.
+ALTER TABLE services ADD COLUMN IF NOT EXISTS traefik_labels jsonb NOT NULL DEFAULT '{}';
+
+-- +goose Down
+ALTER TABLE services DROP COLUMN IF EXISTS traefik_labels;