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-help.toml

@@ -0,0 +1,11 @@
+description = "Executes the help task from the BMAD Method."
+prompt = """
+Execute the BMAD 'help' task.
+
+TASK INSTRUCTIONS:
+1. LOAD the task file from {project-root}/_bmad/core/tasks/help.md
+2. READ its entire contents
+3. FOLLOW every instruction precisely as specified
+
+TASK FILE: {project-root}/_bmad/core/tasks/help.md
+"""