feat: production deployment - full update with providers, admin, glossaries, pricing, tests

Major changes across backend, frontend, infrastructure:
- Provider system with model selection (Google, DeepL, OpenAI, Ollama, Google Cloud)
- Admin panel: user management, pricing, settings
- Glossary system with CSV import/export
- Subscription and tier quota management
- Security hardening (rate limiting, API key auth, path traversal fixes)
- Docker compose for dev, prod, and IONOS deployment
- Alembic migrations for new tables
- Frontend: dashboard, pricing page, landing page, i18n (en/fr)
- Test suite and verification scripts

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

_bmad/bmm/teams/team-fullstack.yaml

@@ -0,0 +1,12 @@
+# <!-- Powered by BMAD-CORE™ -->
+bundle:
+  name: Team Plan and Architect
+  icon: 🚀
+  description: Team capable of project analysis, design, and architecture.
+agents:
+  - analyst
+  - architect
+  - pm
+  - sm
+  - ux-designer
+party: "./default-party.csv"