feat: V2 microservices stack — backend services, gateway, JWT auth

Add full V2 architecture: identity, content, studio (.NET 10) and file,
render, notification, gateway (Go) services with vendored deps, plus DB
migrations, event/API contracts, and an init-db script.

Wire the Next.js frontend to the gateway: server-side JWT auth routes
(login/register/refresh/logout/me), gateway fetch helper, and session/
cookie/jwt helpers under src/lib.

Containerize the stack via docker-compose.v2.yml and per-service
Dockerfiles. Base images resolve through a Nexus mirror (Docker Hub) and
MCR directly; npm/NuGet pull from Nexus groups. Self-host fonts via
next/font/local to avoid Google Fonts (geo-blocked).

Add CI workflow and ignore .env.v2, *.stackdump, and .NET bin/obj.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

services/gateway/vendor/github.com/go-playground/locales/.travis.yml

@@ -0,0 +1,26 @@
+language: go
+go:
+  - 1.13.1
+  - tip
+matrix:
+  allow_failures:
+    - go: tip
+
+notifications:
+  email:
+    recipients: dean.karn@gmail.com
+    on_success: change
+    on_failure: always
+
+before_install:
+  - go install github.com/mattn/goveralls
+
+# Only clone the most recent commit.
+git:
+  depth: 1
+
+script:
+  - go test -v -race -covermode=atomic -coverprofile=coverage.coverprofile ./...
+
+after_success: |
+  goveralls -coverprofile=coverage.coverprofile -service travis-ci -repotoken $COVERALLS_TOKEN