Restructured project

- backend moved to backend directory
- added and initialized frontend with vue
- moved infrastructure files to infra directory

backend/src/config/config.go

@@ -0,0 +1,91 @@
+package config
+
+import (
+	"errors"
+	"os"
+	"strings"
+
+	"github.com/joho/godotenv"
+)
+
+type Config struct {
+	RunMode   RunMode
+	DebugMode bool
+	BotToken  string
+
+	DBConnectionString string
+
+	OCRTokenPath string
+
+	TelegramApi string
+
+	APIPort         string
+	APIHost         string
+	APISecret       string
+	OpenAPIEnabled  bool
+	OpenAPIEndpoint string
+}
+
+func Load() (Config, error) {
+	_ = godotenv.Load()
+	var warnings []string
+
+	mode := os.Getenv("RUN_MODE")
+	debugMode := os.Getenv("DEBUG_MODE") == "true"
+	botToken := os.Getenv("BOT_TOKEN")
+	dbConnectionString := os.Getenv("DB_PATH")
+	ocrTokenPath := os.Getenv("GOOGLE_APPLICATION_CREDENTIALS")
+	apiPort := os.Getenv("API_PORT")
+	apiHost := os.Getenv("API_HOST")
+	apiSecret := os.Getenv("API_SECRET")
+	openAPIEnabled := os.Getenv("OPEN_API_ENABLED") == "true"
+	openAPIEndpoint := os.Getenv("OPEN_API_ENDPOINT")
+
+	runMode, err := ParseRunMode(mode)
+	if err != nil {
+		warnings = append(warnings, err.Error())
+	}
+
+	if runMode == Bot || runMode == Standalone {
+		if ocrTokenPath == "" {
+			warnings = append(warnings, "Missing required environment variable: GOOGLE_APPLICATION_CREDENTIALS")
+		}
+		if botToken == "" {
+			warnings = append(warnings, "Missing required environment variable: BOT_TOKEN")
+		}
+	}
+	if runMode == API || runMode == Standalone {
+		if apiSecret == "" {
+			warnings = append(warnings, "Missing required environment variable: API_SECRET")
+		}
+		if dbConnectionString == "" {
+			dbConnectionString = "sqlite://data/app.db"
+		}
+		if apiHost == "" {
+			apiHost = "localhost"
+		}
+		if apiPort == "" {
+			apiPort = "8000"
+		}
+		if openAPIEndpoint == "" {
+			openAPIEndpoint = "/docs"
+		}
+	}
+
+	if len(warnings) > 0 {
+		return Config{}, errors.New(strings.Join(warnings, "\n"))
+	}
+	return Config{
+		BotToken:           botToken,
+		DBConnectionString: dbConnectionString,
+		OCRTokenPath:       ocrTokenPath,
+		DebugMode:          debugMode,
+		RunMode:            runMode,
+		APIPort:            apiPort,
+		APIHost:            apiHost,
+		APISecret:          apiSecret,
+		OpenAPIEnabled:     openAPIEnabled,
+		OpenAPIEndpoint:    openAPIEndpoint,
+		TelegramApi:        "https://api.telegram.org",
+	}, nil
+}