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/internal/templates/layout.go

@@ -52,6 +52,7 @@ func Layout(title, content string) *template.Template {
     <nav>
         <ul>
             <li><a href="/">Home</a></li>
+            <li><a href="/leads">Leads</a></li>
             <li><a href="/clients">Clients</a></li>
             <li><a href="/customers">Customers</a></li>
             <li><a href="/services">Services</a></li>