feat: TUI views, full state machine, and server integration

Add title, lobby, class select, game, shop, and result screens.
Rewrite model.go with 6-screen state machine and input routing.
Wire server/ssh.go and main.go with lobby and store.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

main.go

@@ -2,12 +2,36 @@ package main
 
 import (
 	"log"
+	"os"
+	"os/signal"
+	"syscall"
 
+	"github.com/tolelom/catacombs/game"
 	"github.com/tolelom/catacombs/server"
+	"github.com/tolelom/catacombs/store"
 )
 
 func main() {
-	if err := server.Start("0.0.0.0", 2222); err != nil {
-		log.Fatal(err)
+	os.MkdirAll("data", 0755)
+
+	db, err := store.Open("data/catacombs.db")
+	if err != nil {
+		log.Fatalf("Failed to open database: %v", err)
 	}
+	defer db.Close()
+
+	lobby := game.NewLobby()
+
+	go func() {
+		if err := server.Start("0.0.0.0", 2222, lobby, db); err != nil {
+			log.Fatal(err)
+		}
+	}()
+
+	log.Println("Catacombs server running on :2222")
+
+	c := make(chan os.Signal, 1)
+	signal.Notify(c, os.Interrupt, syscall.SIGTERM)
+	<-c
+	log.Println("Shutting down...")
 }