feat: initial commit — HermesMessages SaaS platform

Backend (FastAPI + Python 3.12):
- Multi-tenant auth with JWT: login, register, refresh, Meta OAuth
- Business & BusinessConfig management
- WhatsApp webhook with HMAC signature verification
- Bot engine powered by Claude AI
- Calendar availability with Redis caching
- Reservations CRUD with status management
- Dashboard analytics (stats, agenda, peak hours)
- Billing & plan management
- Admin panel with platform-wide stats
- Async bcrypt via asyncio.to_thread
- IntegrityError handling for concurrent registration race conditions

Frontend (React 18 + Vite + Tailwind CSS):
- Multi-step guided registration form with helper text on every field
- Login page with show/hide password toggle
- Protected routes with AuthContext
- Dashboard with stats cards, bar chart, and daily agenda
- Reservations list with search, filters, and inline status actions
- Calendar with weekly view, slot availability, and date blocking
- Config page: business info, schedules, bot personality
- Billing page with plan comparison and usage bar

Design system:
- Bricolage Grotesque + DM Sans typography
- Emerald primary palette with semantic color tokens
- scale(0.97) button press feedback, ease-out animations
- Skeleton loaders, stagger animations, prefers-reduced-motion support
- Accessible: aria-labels, visible focus rings, 4.5:1 contrast

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

backend/app/modules/bot_engine/schemas.py

@@ -0,0 +1,21 @@
+from pydantic import BaseModel
+
+
+class CollectedData(BaseModel):
+    client_name: str | None = None
+    date: str | None = None        # YYYY-MM-DD
+    time_start: str | None = None  # HH:MM
+    party_size: int | None = None
+
+
+class ConversationContext(BaseModel):
+    phone: str
+    business_id: int
+    collected_data: CollectedData = CollectedData()
+    messages: list[dict] = []      # historial {role, content} para Claude
+
+
+class BotResponse(BaseModel):
+    message: str
+    action: str   # "collect_more" | "create_reservation" | "cancel"
+    collected_data: CollectedData