Add Facebook Writer API with models, routers, and migration summary

Co-authored-by: ajay.calsoft <ajay.calsoft@gmail.com>

backend/api/facebook_writer/models/event_models.py

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+"""Pydantic models for Facebook Event functionality."""
+
+from typing import Optional, List, Dict, Any
+from pydantic import BaseModel, Field
+from enum import Enum
+from datetime import datetime
+
+
+class EventType(str, Enum):
+    """Event type options."""
+    WORKSHOP = "Workshop"
+    WEBINAR = "Webinar"
+    CONFERENCE = "Conference"
+    NETWORKING = "Networking event"
+    PRODUCT_LAUNCH = "Product launch"
+    SALE_PROMOTION = "Sale/Promotion"
+    COMMUNITY = "Community event"
+    EDUCATION = "Educational event"
+    CUSTOM = "Custom"
+
+
+class EventFormat(str, Enum):
+    """Event format options."""
+    IN_PERSON = "In-person"
+    VIRTUAL = "Virtual"
+    HYBRID = "Hybrid"
+
+
+class FacebookEventRequest(BaseModel):
+    """Request model for Facebook event generation."""
+    event_name: str = Field(..., description="Name of the event")
+    event_type: EventType = Field(..., description="Type of event")
+    custom_event_type: Optional[str] = Field(None, description="Custom event type if 'Custom' is selected")
+    event_format: EventFormat = Field(..., description="Format of the event")
+    business_type: str = Field(..., description="Type of business hosting the event")
+    target_audience: str = Field(..., description="Target audience for the event")
+    event_date: Optional[str] = Field(None, description="Event date (YYYY-MM-DD format)")
+    event_time: Optional[str] = Field(None, description="Event time")
+    location: Optional[str] = Field(None, description="Event location (physical address or virtual platform)")
+    duration: Optional[str] = Field(None, description="Event duration")
+    key_benefits: Optional[str] = Field(None, description="Key benefits or highlights of attending")
+    speakers: Optional[str] = Field(None, description="Key speakers or presenters")
+    agenda: Optional[str] = Field(None, description="Brief agenda or schedule")
+    ticket_info: Optional[str] = Field(None, description="Ticket pricing and availability")
+    special_offers: Optional[str] = Field(None, description="Special offers or early bird discounts")
+    include: Optional[str] = Field(None, description="Additional elements to include")
+    avoid: Optional[str] = Field(None, description="Elements to avoid")
+
+
+class FacebookEventResponse(BaseModel):
+    """Response model for Facebook event generation."""
+    success: bool = Field(..., description="Whether the generation was successful")
+    event_title: Optional[str] = Field(None, description="Generated event title")
+    event_description: Optional[str] = Field(None, description="Generated event description")
+    short_description: Optional[str] = Field(None, description="Short version for social media")
+    key_highlights: Optional[List[str]] = Field(None, description="Key event highlights")
+    call_to_action: Optional[str] = Field(None, description="Call-to-action text")
+    hashtag_suggestions: Optional[List[str]] = Field(None, description="Hashtag suggestions")
+    promotion_tips: Optional[List[str]] = Field(None, description="Event promotion tips")
+    error: Optional[str] = Field(None, description="Error message if generation failed")
+    metadata: Optional[Dict[str, Any]] = Field(None, description="Additional metadata about the generation")