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/migrations/versions/billing_002_add_tier_name_translations.py

@@ -0,0 +1,31 @@
+"""add name_translations to subscription_tiers
+
+Revision ID: billing_002
+Revises: hosting_001
+Create Date: 2026-03-03
+"""
+
+import sqlalchemy as sa
+
+from alembic import op
+
+revision = "billing_002"
+down_revision = "hosting_001"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.add_column(
+        "subscription_tiers",
+        sa.Column(
+            "name_translations",
+            sa.JSON(),
+            nullable=True,
+            comment="Language-keyed name dict for multi-language support",
+        ),
+    )
+
+
+def downgrade() -> None:
+    op.drop_column("subscription_tiers", "name_translations")