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/prompt.py

@@ -0,0 +1,73 @@
+from app.modules.bot_engine.schemas import CollectedData, ConversationContext
+from app.modules.business.models import Business, BusinessConfig
+from app.modules.calendar.schemas import DayAvailability
+
+DAYS_ES = ["lunes", "martes", "miércoles", "jueves", "viernes", "sábado", "domingo"]
+
+
+def _format_open_days(open_days: list[int]) -> str:
+    return ", ".join(DAYS_ES[d] for d in sorted(open_days))
+
+
+def _format_slots(availability: DayAvailability | None) -> str:
+    if not availability or not availability.is_open:
+        return "No hay disponibilidad para esa fecha."
+    available = [s for s in availability.slots if s.available > 0]
+    if not available:
+        return "No quedan slots disponibles para esa fecha."
+    return ", ".join(s.time_start.strftime("%H:%M") for s in available)
+
+
+def build_system_prompt(
+    business: Business,
+    config: BusinessConfig,
+    availability: DayAvailability | None,
+    context: ConversationContext,
+) -> str:
+    tone_instruction = (
+        "Usa un tono formal y profesional."
+        if config.tone == "formal"
+        else "Usa un tono amigable y cercano."
+    )
+
+    collected = context.collected_data
+    collected_summary = "\n".join([
+        f"- Nombre: {collected.client_name or 'pendiente'}",
+        f"- Fecha: {collected.date or 'pendiente'}",
+        f"- Hora: {collected.time_start or 'pendiente'}",
+        f"- Personas: {collected.party_size or 'pendiente'}",
+    ])
+
+    slots_info = _format_slots(availability)
+
+    return f"""Eres {config.assistant_name}, asistente virtual de {business.name}.
+{tone_instruction}
+Responde SIEMPRE en el idioma del cliente.
+
+HORARIO DEL NEGOCIO:
+- Días de atención: {_format_open_days(config.open_days or [])}
+- Horario: {config.open_time.strftime("%H:%M")} a {config.close_time.strftime("%H:%M")}
+- Duración de cada turno: {config.slot_duration} minutos
+- Capacidad por turno: {config.max_per_slot} persona(s)
+
+SLOTS DISPONIBLES PARA LA FECHA SOLICITADA: {slots_info}
+
+DATOS YA RECOPILADOS DEL CLIENTE:
+{collected_summary}
+
+OBJETIVO: Recopilar nombre, fecha, hora y número de personas para crear la reserva.
+Si ya tienes todos los datos, acción = "create_reservation".
+Si el cliente quiere cancelar, acción = "cancel".
+En cualquier otro caso, acción = "collect_more".
+
+Responde ÚNICAMENTE con JSON válido siguiendo este esquema exacto (sin markdown, sin explicaciones):
+{{
+  "message": "<texto para enviar al cliente>",
+  "action": "collect_more" | "create_reservation" | "cancel",
+  "collected_data": {{
+    "client_name": null | "<nombre>",
+    "date": null | "<YYYY-MM-DD>",
+    "time_start": null | "<HH:MM>",
+    "party_size": null | <número>
+  }}
+}}"""