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/post.py

@@ -5,6 +5,7 @@ Modelo de Post - Posts generados y programados.
 from datetime import datetime
 from sqlalchemy import Column, Integer, String, Text, Boolean, DateTime, ForeignKey, JSON, Enum
 from sqlalchemy.dialects.postgresql import ARRAY
+from sqlalchemy.orm import relationship
 import enum
 
 from app.core.database import Base
@@ -93,10 +94,21 @@ class Post(Base):
     metrics = Column(JSON, nullable=True)
     # Ejemplo: {"likes": 10, "retweets": 5, "comments": 3}
 
+    # A/B Testing
+    ab_test_id = Column(Integer, ForeignKey("ab_tests.id"), nullable=True, index=True)
+
+    # Recycling
+    is_recyclable = Column(Boolean, default=True)
+    recycled_from_id = Column(Integer, ForeignKey("posts.id"), nullable=True)
+    recycle_count = Column(Integer, default=0)  # Times this post has been recycled
+
     # Timestamps
     created_at = Column(DateTime, default=datetime.utcnow)
     updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
 
+    # Relationships
+    metrics_history = relationship("PostMetrics", back_populates="post", cascade="all, delete-orphan")
+
     def __repr__(self):
         return f"<Post {self.id} - {self.status}>"
 
@@ -120,7 +132,11 @@ class Post(Base):
             "approval_required": self.approval_required,
             "hashtags": self.hashtags,
             "metrics": self.metrics,
-            "created_at": self.created_at.isoformat() if self.created_at else None
+            "created_at": self.created_at.isoformat() if self.created_at else None,
+            "ab_test_id": self.ab_test_id,
+            "is_recyclable": self.is_recyclable,
+            "recycled_from_id": self.recycled_from_id,
+            "recycle_count": self.recycle_count
         }
 
     def get_content_for_platform(self, platform: str) -> str: