fix(i18n): translate pricing tiers, features, and content pages

Add name_translations JSON column to SubscriptionTier for multi-language
tier names. Pre-resolve tier names and build dynamic feature lists from
module providers in route handlers. Fix Jinja2 macro scoping by importing
pricing partial with context. Backfill content_translations for all 43
content pages across 4 platforms (en/fr/de/lb).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/modules/billing/models/subscription.py

@@ -100,6 +100,12 @@ class SubscriptionTier(Base, TimestampMixin):
 
     code = Column(String(30), nullable=False, index=True)
     name = Column(String(100), nullable=False)
+    name_translations = Column(
+        JSON,
+        nullable=True,
+        default=None,
+        comment="Language-keyed name dict for multi-language support",
+    )
     description = Column(Text, nullable=True)
 
     # Pricing (in cents for precision)
@@ -154,6 +160,16 @@ class SubscriptionTier(Base, TimestampMixin):
         """Check if this tier includes a specific feature."""
         return feature_code in self.get_feature_codes()
 
+    def get_translated_name(self, lang: str, default_lang: str = "fr") -> str:
+        """Get name in the given language, falling back to default_lang then self.name."""
+        if self.name_translations:
+            return (
+                self.name_translations.get(lang)
+                or self.name_translations.get(default_lang)
+                or self.name
+            )
+        return self.name
+
 
 # ============================================================================
 # AddOnProduct - Purchasable add-ons