重构: 拆分main.go为5个文件 + 壁纸HTML移至web目录

- main.go: 入口+单实例互斥锁
- win32.go: Win32 API/embed/evalJS/全局变量
- config.go: 配置读写+图标生成
- weather.go: 天气API/定位/天气循环
- systray.go: 托盘菜单/WebView/全屏监控
- wallpaper.html → web/wallpaper.html

config.go

@@ -0,0 +1,64 @@
+package main
+
+import (
+	"bytes"
+	"encoding/binary"
+	"encoding/json"
+	"image"
+	"image/color"
+	"image/png"
+	"os"
+)
+
+type Config struct {
+	Zodiac string `json:"zodiac"`
+	City   string `json:"city"`
+}
+
+const defaultZodiac = "射手座"
+
+var configPath string
+
+func loadConfig() *Config {
+	data, err := os.ReadFile(configPath)
+	if err != nil {
+		return &Config{Zodiac: defaultZodiac}
+	}
+	var cfg Config
+	if json.Unmarshal(data, &cfg) != nil {
+		return &Config{Zodiac: defaultZodiac}
+	}
+	if cfg.Zodiac == "" {
+		cfg.Zodiac = defaultZodiac
+	}
+	return &cfg
+}
+
+func saveConfig(cfg *Config) error {
+	data, _ := json.MarshalIndent(cfg, "", "  ")
+	return os.WriteFile(configPath, data, 0644)
+}
+
+func generateIcon() []byte {
+	img := image.NewRGBA(image.Rect(0, 0, 16, 16))
+	c := color.RGBA{R: 88, G: 101, B: 242, A: 255}
+	for y := 0; y < 16; y++ {
+		for x := 0; x < 16; x++ {
+			img.Set(x, y, c)
+		}
+	}
+	var buf bytes.Buffer
+	png.Encode(&buf, img)
+	pngData := buf.Bytes()
+	ico := make([]byte, 22+len(pngData))
+	binary.LittleEndian.PutUint16(ico[0:], 0)
+	binary.LittleEndian.PutUint16(ico[2:], 1)
+	binary.LittleEndian.PutUint16(ico[4:], 1)
+	ico[6], ico[7], ico[8], ico[9] = 16, 16, 0, 0
+	binary.LittleEndian.PutUint16(ico[10:], 1)
+	binary.LittleEndian.PutUint16(ico[12:], 32)
+	binary.LittleEndian.PutUint32(ico[14:], uint32(len(pngData)))
+	binary.LittleEndian.PutUint32(ico[18:], 22)
+	copy(ico[22:], pngData)
+	return ico
+}