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/internal/deployment/edge_labels_test.go

@@ -0,0 +1,60 @@
+package deployment
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestEdgeLabelsCustomMiddlewares(t *testing.T) {
+	spec := RuntimeSpec{
+		ServiceID: "01234567-89ab-cdef-0123-456789abcdef",
+		Port:      8080,
+		Domains:   []string{"app.example.com"},
+		TraefikLabels: map[string]string{
+			"middlewares.rl.ratelimit.average":                              "100",
+			"middlewares.rl.ratelimit.period":                               "1m",
+			"middlewares.sec.headers.customresponseheaders.X-Frame-Options": "DENY",
+		},
+	}
+	labels := edgeLabels(spec, "containr-edge")
+
+	if got := labels["traefik.http.middlewares.svc-01234567-rl.ratelimit.average"]; got != "100" {
+		t.Fatalf("ratelimit label missing: %v", labels)
+	}
+	if got := labels["traefik.http.middlewares.svc-01234567-sec.headers.customresponseheaders.X-Frame-Options"]; got != "DENY" {
+		t.Fatalf("headers label missing: %v", labels)
+	}
+	chain := labels["traefik.http.routers.svc-01234567.middlewares"]
+	if chain != "svc-01234567-rl,svc-01234567-sec" {
+		t.Fatalf("middleware chain wrong: %q", chain)
+	}
+}
+
+func TestEdgeLabelsCustomAfterBuiltins(t *testing.T) {
+	spec := RuntimeSpec{
+		ServiceID:      "01234567-89ab-cdef-0123-456789abcdef",
+		Port:           8080,
+		Domains:        []string{"app.example.com"},
+		BasicAuthUsers: "u:$apr1$x",
+		TraefikLabels: map[string]string{
+			"middlewares.rl.ratelimit.average": "10",
+		},
+	}
+	labels := edgeLabels(spec, "containr-edge")
+	chain := labels["traefik.http.routers.svc-01234567.middlewares"]
+	if !strings.HasPrefix(chain, "svc-01234567-auth,") || !strings.HasSuffix(chain, "svc-01234567-rl") {
+		t.Fatalf("builtin should precede custom: %q", chain)
+	}
+}
+
+func TestEdgeLabelsNoCustom(t *testing.T) {
+	spec := RuntimeSpec{
+		ServiceID: "01234567-89ab-cdef-0123-456789abcdef",
+		Port:      8080,
+		Domains:   []string{"app.example.com"},
+	}
+	labels := edgeLabels(spec, "containr-edge")
+	if _, ok := labels["traefik.http.routers.svc-01234567.middlewares"]; ok {
+		t.Fatal("middleware chain should be absent with no middlewares")
+	}
+}