feat(ui): add wedding theme styles and layout components

* Introduced wedding-themed CSS variables for styling.
* Created layout component for the wedding site with navigation and countdown.
* Added RSVP and photo upload pages with form handling.
* Implemented QR code page for wedding site access.
* Configured TypeScript and Vite for the project.
* Added robots.txt for search engine crawling.

server/internal/config/config.go

@@ -0,0 +1,94 @@
+package config
+
+import (
+	"fmt"
+	"os"
+	"time"
+
+	"gopkg.in/yaml.v3"
+)
+
+type Config struct {
+	Server  ServerConfig  `yaml:"server"`
+	Site    SiteConfig    `yaml:"site"`
+	Wedding WeddingConfig `yaml:"wedding"`
+	Storage StorageConfig `yaml:"storage"`
+	Email   EmailConfig   `yaml:"email"`
+	Upload  UploadConfig  `yaml:"upload"`
+}
+
+type ServerConfig struct {
+	Port int `yaml:"port"`
+}
+
+type SiteConfig struct {
+	URL string `yaml:"url"`
+}
+
+type WeddingConfig struct {
+	Date         time.Time `yaml:"date"`
+	CeremonyTime string    `yaml:"ceremony_time"`
+	RSVPBy       time.Time `yaml:"rsvp_by"`
+	VenueName    string    `yaml:"venue_name"`
+	VenueAddress string    `yaml:"venue_address"`
+	RSVPPhone    string    `yaml:"rsvp_phone"`
+}
+
+type StorageConfig struct {
+	DataDir string `yaml:"data_dir"`
+}
+
+type EmailConfig struct {
+	SMTPHost string `yaml:"smtp_host"`
+	SMTPPort int    `yaml:"smtp_port"`
+	SMTPUser string `yaml:"smtp_user"`
+	SMTPPass string `yaml:"smtp_pass"`
+	From     string `yaml:"from"`
+	To       string `yaml:"to"`
+}
+
+type UploadConfig struct {
+	MaxSizeMB int `yaml:"max_size_mb"`
+	MaxFiles  int `yaml:"max_files"`
+}
+
+// Path resolves the config file location: $CONFIG_PATH, or ./config.yaml.
+func Path() string {
+	if p := os.Getenv("CONFIG_PATH"); p != "" {
+		return p
+	}
+	return "config.yaml"
+}
+
+func Load(path string) (*Config, error) {
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return nil, fmt.Errorf("reading config %s: %w", path, err)
+	}
+
+	var cfg Config
+	if err := yaml.Unmarshal(data, &cfg); err != nil {
+		return nil, fmt.Errorf("parsing config %s: %w", path, err)
+	}
+
+	if cfg.Server.Port == 0 {
+		cfg.Server.Port = 8080
+	}
+	if cfg.Storage.DataDir == "" {
+		cfg.Storage.DataDir = "./data"
+	}
+	if cfg.Upload.MaxSizeMB == 0 {
+		cfg.Upload.MaxSizeMB = 15
+	}
+	if cfg.Upload.MaxFiles == 0 {
+		cfg.Upload.MaxFiles = 10
+	}
+	if cfg.Wedding.Date.IsZero() {
+		return nil, fmt.Errorf("wedding.date is required in %s", path)
+	}
+	if cfg.Wedding.RSVPBy.IsZero() {
+		return nil, fmt.Errorf("wedding.rsvp_by is required in %s", path)
+	}
+
+	return &cfg, nil
+}