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>

models/subscription.py

@@ -63,8 +63,8 @@ PLANS = {
     },
     PlanType.STARTER: {
         "name": "Starter",
-        "price_monthly": 7.99,
-        "price_yearly": 76.70,   # -20 %
+        "price_monthly": 9.00,
+        "price_yearly": 86.40,   # -20 %
         "docs_per_month": 50,
         "max_pages_per_doc": 50,
         "max_file_size_mb": 10,
@@ -89,13 +89,13 @@ PLANS = {
     },
     PlanType.PRO: {
         "name": "Pro",
-        "price_monthly": 19.99,
-        "price_yearly": 191.90,  # -20 %
+        "price_monthly": 19.00,
+        "price_yearly": 182.40,  # -20 %
         "docs_per_month": 200,
         "max_pages_per_doc": 200,
         "max_file_size_mb": 25,
         "max_chars_per_month": 2_000_000,
-        "providers": ["google", "deepl", "openrouter"],
+        "providers": ["google", "google_cloud", "deepl", "openrouter"],
         "ai_model_essential": "deepseek/deepseek-v3.2",
         "features": [
             "200 documents / mois",
@@ -119,13 +119,13 @@ PLANS = {
     },
     PlanType.BUSINESS: {
         "name": "Business",
-        "price_monthly": 49.99,
-        "price_yearly": 479.90,  # -20 %
+        "price_monthly": 49.00,
+        "price_yearly": 470.40,  # -20 %
         "docs_per_month": 1000,
         "max_pages_per_doc": 500,
         "max_file_size_mb": 50,
         "max_chars_per_month": 10_000_000,
-        "providers": ["google", "deepl", "openrouter", "openrouter_premium", "openai", "zai"],
+        "providers": ["google", "google_cloud", "deepl", "openrouter", "openrouter_premium", "openai", "zai"],
         "ai_model_essential": "deepseek/deepseek-v3.2",
         "ai_model_premium": "anthropic/claude-3.5-haiku",
         "features": [
@@ -161,7 +161,7 @@ PLANS = {
         "max_pages_per_doc": -1,
         "max_file_size_mb": -1,
         "max_chars_per_month": -1,
-        "providers": ["google", "deepl", "openrouter", "openrouter_premium", "openai", "zai", "custom"],
+        "providers": ["google", "google_cloud", "deepl", "openrouter", "openrouter_premium", "openai", "zai", "custom"],
         "features": [
             "Documents illimités",
             "Tous les modèles IA (GPT-5, Claude Opus 4.6...)",
@@ -209,6 +209,7 @@ class User(BaseModel):
     stripe_customer_id: Optional[str] = None
     stripe_subscription_id: Optional[str] = None
     subscription_ends_at: Optional[datetime] = None
+    cancel_at_period_end: bool = False
 
     # Usage tracking
     docs_translated_this_month: int = 0
@@ -265,6 +266,8 @@ class UserResponse(BaseModel):
     plan: PlanType
     tier: PlanType
     subscription_status: SubscriptionStatus
+    subscription_ends_at: Optional[datetime] = None
+    cancel_at_period_end: bool = False
     docs_translated_this_month: int
     pages_translated_this_month: int
     api_calls_this_month: int