feat(go-crm): full auth, routing, middleware, and supporting infra

- Add auth handlers (signup, login, logout, account management) with bcrypt
- Add client, customer, service, scheduling, payment, question, answer handlers
- Add dashboard, monthly report, and lead pipeline pages
- Add UTF-8 middleware to force charset on HTML responses
- Add config package with env-based overrides for DB path, secrets, endpoints
- Add parser package for WhatsApp message ingestion
- Add clean-arch layers: pkg/domain, pkg/repo, pkg/usecase for leads
- Add cmd/migrate utility for DB migrations
- Add Makefile, README, run-tests.sh, and dev scripts
- Update docker-compose.yml with memory limits
- Update .air.toml to exclude DB files and stop on errors
- Update whatsapp-sync dependencies and add src/index.js entrypoint
- Add whatsme standalone WhatsApp reader app (source only)
- Untrack .opencode-sandbox/data/go-crm.db from git history
- Expand root .gitignore: ngrok, tmp dirs, sandbox DBs, compiled binaries

apps/go-crm/pkg/domain/lead.go

@@ -0,0 +1,31 @@
+// Package domain defines core business entities and interfaces.
+package domain
+
+import "context"
+
+// Lead represents a customer lead with service interest, status, and payment info.
+type Lead struct {
+	LeadID          int64   `json:"lead_id"`
+	ClientID        int64   `json:"client_id"`
+	Name            string  `json:"name"`
+	PhoneRaw        string  `json:"phone_raw"`
+	PhoneNormalized string  `json:"phone_normalized"`
+	ServiceInterest string  `json:"service_interest"`
+	Status          string  `json:"status"`
+	NeedsReview     bool    `json:"needs_review"`
+	AppointmentDate string  `json:"appointment_date,omitempty"`
+	AppointmentTime string  `json:"appointment_time,omitempty"`
+	PaymentStatus   string  `json:"payment_status"`
+	PaymentAmount   float64 `json:"payment_amount,omitempty"`
+	PaymentDate     string  `json:"payment_date,omitempty"`
+	CreatedAt       int64   `json:"created_at"`
+	LastContactAt   int64   `json:"last_contact_at"`
+}
+
+// LeadRepository defines persistence operations for leads.
+type LeadRepository interface {
+	// ListAll retrieves all leads for a client, with pagination.
+	ListAll(ctx context.Context, clientID int64, limit, offset int) ([]Lead, error)
+	// Update saves changes to an existing lead.
+	Update(ctx context.Context, lead Lead) error
+}