feat: Add Analytics, Odoo Integration, A/B Testing, and Content features

Phase 1 - Analytics y Reportes:
- PostMetrics and AnalyticsReport models for tracking engagement
- Analytics service with dashboard stats, top posts, optimal times
- 8 API endpoints at /api/analytics/*
- Interactive dashboard with Chart.js charts
- Celery tasks for metrics fetch (15min) and weekly reports

Phase 2 - Integración Odoo:
- Lead and OdooSyncLog models for CRM integration
- Odoo fields added to Product and Service models
- XML-RPC service for bidirectional sync
- Lead management API at /api/leads/*
- Leads dashboard template
- Celery tasks for product/service sync and lead export

Phase 3 - A/B Testing y Recycling:
- ABTest, ABTestVariant, RecycledPost models
- Statistical winner analysis using chi-square test
- Content recycling with engagement-based scoring
- APIs at /api/ab-tests/* and /api/recycling/*
- Automated test evaluation and content recycling tasks

Phase 4 - Thread Series y Templates:
- ThreadSeries and ThreadPost models for multi-post threads
- AI-powered thread generation
- Enhanced ImageTemplate with HTML template support
- APIs at /api/threads/* and /api/templates/*
- Thread scheduling with reply chain support

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/models/image_template.py

@@ -25,7 +25,17 @@ class ImageTemplate(Base):
     # Categorías: tip, producto, servicio, promocion, etc.
 
     # Archivo de plantilla
-    template_file = Column(String(255), nullable=False)  # Ruta al archivo HTML/template
+    template_file = Column(String(255), nullable=True)  # Ruta al archivo HTML/template
+
+    # HTML template content (for inline templates)
+    html_template = Column(Text, nullable=True)
+
+    # Template type
+    template_type = Column(String(50), default="general")
+    # Types: tip_card, product_card, quote, promo, announcement
+
+    # Preview image
+    preview_url = Column(String(500), nullable=True)
 
     # Variables que acepta la plantilla
     variables = Column(ARRAY(String), nullable=False)
@@ -67,6 +77,9 @@ class ImageTemplate(Base):
             "description": self.description,
             "category": self.category,
             "template_file": self.template_file,
+            "html_template": self.html_template[:100] + "..." if self.html_template and len(self.html_template) > 100 else self.html_template,
+            "template_type": self.template_type,
+            "preview_url": self.preview_url,
             "variables": self.variables,
             "design_config": self.design_config,
             "output_sizes": self.output_sizes,