Add Technical Kiwi website with Go, templ, and HTMX.

Single-page site with gallery by album and event, contact form over SMTP,
Docker dev/prod setup, and on-server image derivatives. Gallery photos stay
local (app/images/ is gitignored).

Co-authored-by: Cursor <cursoragent@cursor.com>

app/internal/contact/validate_test.go

@@ -0,0 +1,27 @@
+package contact
+
+import "testing"
+
+func TestParse_valid(t *testing.T) {
+	sub, errs := Parse("Jimmy", "jim@example.com", "Hello there, this is a test message.")
+	if errs.Any() {
+		t.Fatalf("unexpected errors: %v", errs)
+	}
+	if sub.Name != "Jimmy" || sub.Email != "jim@example.com" {
+		t.Fatalf("got %+v", sub)
+	}
+}
+
+func TestParse_shortMessage(t *testing.T) {
+	_, errs := Parse("Jimmy", "jim@example.com", "short")
+	if !errs.Any() {
+		t.Fatal("expected validation error")
+	}
+}
+
+func TestParse_invalidEmail(t *testing.T) {
+	_, errs := Parse("Jimmy", "not-an-email", "This message is long enough to pass.")
+	if errs["email"] == "" {
+		t.Fatal("expected email error")
+	}
+}