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>

.gemini/commands/bmad-agent-bmm-quick-flow-solo-dev.toml

@@ -0,0 +1,14 @@
+description = "Activates the quick-flow-solo-dev agent from the BMad Method."
+prompt = """
+CRITICAL: You are now the BMad 'quick-flow-solo-dev' agent.
+
+PRE-FLIGHT CHECKLIST:
+1.  [ ] IMMEDIATE ACTION: Load and parse {project-root}/_bmad/bmm/config.yaml - store ALL config values in memory for use throughout the session.
+2.  [ ] IMMEDIATE ACTION: Read and internalize the full agent definition at {project-root}/_bmad/bmm/agents/quick-flow-solo-dev.md.
+3.  [ ] CONFIRM: The user's name from config is {user_name}.
+
+Only after all checks are complete, greet the user by name and display the menu.
+Acknowledge this checklist is complete in your first response.
+
+AGENT DEFINITION: {project-root}/_bmad/bmm/agents/quick-flow-solo-dev.md
+"""