feat(whatsapp): 🎉 Add extended sending and template management

* Implemented new endpoints for sending various message types:
  - Audio
  - Sticker
  - Location
  - Contacts
  - Interactive messages
  - Template messages
  - Flow messages
  - Reactions
  - Marking messages as read

* Added template management endpoints:
  - List templates
  - Upload templates
  - Delete templates

* Introduced flow management endpoints:
  - List flows
  - Create flows
  - Get flow details
  - Upload flow assets
  - Publish flows
  - Delete flows

* Added phone number management endpoints:
  - List phone numbers
  - Request verification code
  - Verify code

* Enhanced media management with delete media endpoint.

* Updated dependencies.

pkg/handlers/handlers.go

@@ -2,12 +2,14 @@ package handlers
 
 import (
 	"encoding/json"
+	"fmt"
 	"net/http"
 
 	"git.warky.dev/wdevs/whatshooked/pkg/config"
 	"git.warky.dev/wdevs/whatshooked/pkg/hooks"
 	"git.warky.dev/wdevs/whatshooked/pkg/logging"
 	"git.warky.dev/wdevs/whatshooked/pkg/whatsapp"
+	"git.warky.dev/wdevs/whatshooked/pkg/whatsapp/businessapi"
 )
 
 // Handlers holds all HTTP handlers with their dependencies
@@ -57,6 +59,23 @@ func (h *Handlers) WithAuthConfig(cfg *AuthConfig) *Handlers {
 	return h
 }
 
+// getBusinessAPIClient looks up an account and asserts it is a Business API client.
+// Returns a typed *businessapi.Client or an error with an appropriate message.
+func (h *Handlers) getBusinessAPIClient(accountID string) (*businessapi.Client, error) {
+	if accountID == "" {
+		return nil, fmt.Errorf("account_id is required")
+	}
+	client, exists := h.whatsappMgr.GetClient(accountID)
+	if !exists {
+		return nil, fmt.Errorf("account %s not found", accountID)
+	}
+	baClient, ok := client.(*businessapi.Client)
+	if !ok {
+		return nil, fmt.Errorf("account %s is not a Business API account (type: %s)", accountID, client.GetType())
+	}
+	return baClient, nil
+}
+
 // writeJSON is a helper that writes JSON response and logs errors
 func writeJSON(w http.ResponseWriter, v interface{}) {
 	if err := json.NewEncoder(w).Encode(v); err != nil {