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/business/schemas.py

@@ -0,0 +1,48 @@
+from datetime import date, time
+
+from pydantic import BaseModel
+
+
+class BusinessRead(BaseModel):
+    id: int
+    name: str
+    type: str
+    timezone: str
+    status: str
+    plan: str
+    meta_business_id: str | None
+    whatsapp_phone_number_id: str | None
+
+    model_config = {"from_attributes": True}
+
+
+class BusinessUpdate(BaseModel):
+    name: str | None = None
+    type: str | None = None
+    timezone: str | None = None
+
+
+class BusinessConfigRead(BaseModel):
+    open_days: list[int]
+    open_time: time
+    close_time: time
+    slot_duration: int
+    max_per_slot: int
+    blocked_dates: list[date]
+    assistant_name: str
+    tone: str
+    welcome_message: str | None
+
+    model_config = {"from_attributes": True}
+
+
+class BusinessConfigUpdate(BaseModel):
+    open_days: list[int] | None = None
+    open_time: time | None = None
+    close_time: time | None = None
+    slot_duration: int | None = None
+    max_per_slot: int | None = None
+    blocked_dates: list[date] | None = None
+    assistant_name: str | None = None
+    tone: str | None = None
+    welcome_message: str | None = None