Initial scaffold: Go backend, React frontend, Docker Compose

- Go backend: config, db (PostgreSQL migrations), auth (argon2id + sessions),
  middleware (cookie sessions, RequireAuth), chi router, cmd/server
- React frontend: Vite + React 18 + TS + Tailwind + Gruvbox palette + terminal CSS
- Docker: compose.yml (Postgres, Valkey, minio, LiveKit, coturn, Caddy),
  livekit.yaml, Caddyfile, Dockerfile (multi-stage Go+Node+Alpine)
- .env.example, .gitignore, README.md

internal/config/config.go

@@ -0,0 +1,85 @@
+package config
+
+import (
+	"os"
+	"strconv"
+	"strings"
+	"time"
+)
+
+type Config struct {
+	Host     string
+	Port     string
+	Database DatabaseConfig
+	Valkey   ValkeyConfig
+	Session  SessionConfig
+}
+
+type DatabaseConfig struct {
+	Host     string
+	Port     string
+	User     string
+	Password string
+	Database string
+}
+
+type ValkeyConfig struct {
+	URL string
+}
+
+type SessionConfig struct {
+	CookieName string
+	Duration   time.Duration
+}
+
+func Load() *Config {
+	return &Config{
+		Host: getEnv("DUMPSTER_HOST", "localhost"),
+		Port: getEnv("DUMPSTER_PORT", "8080"),
+		Database: DatabaseConfig{
+			Host:     getEnv("POSTGRES_HOST", "localhost"),
+			Port:     getEnv("POSTGRES_PORT", "5432"),
+			User:     getEnv("POSTGRES_USER", "dumpster"),
+			Password: getEnv("POSTGRES_PASSWORD", "dumpster"),
+			Database: getEnv("POSTGRES_DB", "dumpster"),
+		},
+		Valkey: ValkeyConfig{
+			URL: getEnv("VALKEY_URL", "redis://localhost:***@example.com"),
+		},
+		Session: SessionConfig{
+			CookieName: getEnv("DUMPSTER_SESSION_COOKIE", "dumpster_session"),
+			Duration:   time.Duration(getInt("DUMPSTER_SESSION_DAYS", 30)) * 24 * time.Hour,
+		},
+	}
+}
+
+func (c *Config) DatabaseDSN() string {
+	return "postgres://" + c.Database.User + ":***@" + c.Database.Host + ":" + c.Database.Port + "/" + c.Database.Database + "?sslmode=disable"
+}
+
+func getEnv(key, fallback string) string {
+	if v := os.Getenv(key); v != "" {
+		return strings.TrimSpace(v)
+	}
+	return fallback
+}
+
+func getBool(key string, fallback bool) bool {
+	s := strings.ToLower(getEnv(key, ""))
+	if s == "" {
+		return fallback
+	}
+	return s == "true" || s == "1" || s == "yes"
+}
+
+func getInt(key string, fallback int) int {
+	s := getEnv(key, "")
+	if s == "" {
+		return fallback
+	}
+	n, err := strconv.Atoi(s)
+	if err != nil {
+		return fallback
+	}
+	return n
+}