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/cmd/server/main.go

@@ -0,0 +1,68 @@
+package main
+
+import (
+	"flag"
+	"log"
+	"net/http"
+	"os"
+	"path/filepath"
+
+	"technical.kiwi/website/internal/gallery"
+	"technical.kiwi/website/internal/handlers"
+	"technical.kiwi/website/internal/mail"
+	"technical.kiwi/website/internal/middleware"
+)
+
+func main() {
+	thumbsOnly := flag.Bool("thumbs", false, "generate gallery thumbnails and exit")
+	flag.Parse()
+
+	root, err := os.Getwd()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	imagesDir := filepath.Join(root, "images")
+	staticDir := filepath.Join(root, "static")
+
+	if *thumbsOnly {
+		if err := gallery.EnsureThumbnails(imagesDir); err != nil {
+			log.Fatal(err)
+		}
+		log.Print("thumbnails generated")
+		return
+	}
+
+	var mailCfg *mail.Config
+	if mail.Enabled() {
+		cfg, err := mail.Load()
+		if err != nil {
+			log.Fatalf("smtp config: %v", err)
+		}
+		mailCfg = &cfg
+		log.Printf("contact form: smtp relay %s:%d → %s", cfg.Host, cfg.Port, cfg.To)
+	} else {
+		log.Print("contact form: disabled (set SMTP_HOST, SMTP_FROM, SMTP_TO to enable)")
+	}
+
+	srv, err := handlers.New(imagesDir, staticDir, mailCfg)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	mux := http.NewServeMux()
+	srv.RegisterRoutes(mux)
+
+	addr := envOr("ADDR", ":8080")
+	log.Printf("Technical Kiwi website listening on %s", addr)
+	if err := http.ListenAndServe(addr, middleware.Gzip(mux)); err != nil {
+		log.Fatal(err)
+	}
+}
+
+func envOr(key, fallback string) string {
+	if v := os.Getenv(key); v != "" {
+		return v
+	}
+	return fallback
+}