Squashed commit of the following:

commit d2ec8c0f07
Author: mario <dev.mario@sismedika@gmail.com>
Date:   Thu May 15 15:42:33 2025 +0700

    add: db tx commit and rollback implementation

commit 264435f67e
Author: mario <dev.mario@sismedika@gmail.com>
Date:   Thu May 15 14:34:20 2025 +0700

    fix: shortlink generation logic update/create

commit 047ab1937a
Author: mario <dev.mario@sismedika@gmail.com>
Date:   Thu May 15 11:06:04 2025 +0700

    fix: if multiple studies patient, show first study by default

commit c13f834b92
Author: mario <dev.mario@sismedika@gmail.com>
Date:   Thu May 15 09:46:32 2025 +0700

    add: register and login with DB query AND some struct type correction

commit dd4451c2a8
Author: mario <dev.mario@sismedika@gmail.com>
Date:   Wed May 14 10:23:33 2025 +0700

    new file structure & koneksi ke DB

commit 8289881df3
Author: mario <dev.mario@sismedika@gmail.com>
Date:   Tue May 13 16:49:07 2025 +0700

    edit: rm debug route

commit dd784da232
Author: mario <dev.mario@sismedika@gmail.com>
Date:   Tue May 13 15:44:11 2025 +0700

    add: implement shortlink

commit 2687a761cc
Author: mario <dev.mario@sismedika@gmail.com>
Date:   Tue May 13 11:47:19 2025 +0700

    add new dummy doctor user

commit eb67eaca46
Author: mario <dev.mario@sismedika@gmail.com>
Date:   Tue May 13 11:46:28 2025 +0700

    add: ref_doctor studylist filter

commit 0d4825d152
Author: mario <dev.mario@sismedika@gmail.com>
Date:   Tue May 13 10:07:16 2025 +0700

    edit study_iuids & accNum in patient jwt to array

commit 2d1f135fda
Author: mario <dev.mario@sismedika@gmail.com>
Date:   Tue May 13 09:52:45 2025 +0700

    patient see their multiple studies

commit 13bb380f51
Author: mario <dev.mario@sismedika@gmail.com>
Date:   Fri May 9 10:13:16 2025 +0700

    add: cors handler route and readme

commit 6c9ab574ce
Author: mario <dev.mario@sismedika@gmail.com>
Date:   Mon May 5 11:50:36 2025 +0700

    add: login & token validation tapi belum connect ke DB

commit 297c9a6a01
Author: mario <dev.mario@sismedika@gmail.com>
Date:   Mon Apr 28 15:37:02 2025 +0700

    add readme.md

commit 9b8e0260f3
Author: mario <dev.mario@sismedika@gmail.com>
Date:   Mon Apr 7 15:46:07 2025 +0700

    connected-to-google

commit f340bc5916
Author: mario <dev.mario@sismedika.com>
Date:   Mon Apr 7 11:14:18 2025 +0700

    init

config/config.go

@@ -0,0 +1,76 @@
+package config
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/spf13/viper"
+)
+
+// Config represents the application configuration
+type Config struct {
+	Server struct {
+		Port                int `mapstructure:"port"`
+		ReadTimeoutSeconds  int `mapstructure:"read_timeout_seconds"`
+		WriteTimeoutSeconds int `mapstructure:"write_timeout_seconds"`
+		IdleTimeoutSeconds  int `mapstructure:"idle_timeout_seconds"`
+	} `mapstructure:"server"`
+
+	LogLevel string `mapstructure:"log_level"`
+
+	Google struct {
+		ProjectID       string `mapstructure:"project_id"`
+		Location        string `mapstructure:"location"`
+		Dataset         string `mapstructure:"dataset"`
+		DicomStore      string `mapstructure:"dicom_store"`
+		CredentialsPath string `mapstructure:"credentials_path"`
+	} `mapstructure:"google"`
+
+	Auth struct {
+		JWTSecret          string `mapstructure:"jwt_secret"`
+		AccessTokenExpiry  int    `mapstructure:"access_token_expiry"`  // in minutes
+		RefreshTokenExpiry int    `mapstructure:"refresh_token_expiry"` // in hours
+		EnableDatabaseAuth bool   `mapstructure:"enable_database_auth"`
+	} `mapstructure:"auth"`
+
+	Shortlink struct {
+		BaseURL            string `mapstructure:"base_url"`             // Base URL for shortlinks (e.g., https://example.com)
+		DefaultExpiryHours int    `mapstructure:"default_expiry_hours"` // Default expiry time in hours
+		MaxAttempts        int    `mapstructure:"max_attempts"`         // Maximum failed attempts allowed
+	} `mapstructure:"shortlink"`
+
+	Database struct {
+		Host                string `mapstructure:"host"`
+		Port                int    `mapstructure:"port"`
+		User                string `mapstructure:"user"`
+		Password            string `mapstructure:"password"`
+		Name                string `mapstructure:"name"`
+		MaxOpenConns        int    `mapstructure:"max_open_conns"`
+		MaxIdleConns        int    `mapstructure:"max_idle_conns"`
+		ConnMaxLifetimeMins int    `mapstructure:"conn_max_lifetime_mins"`
+	} `mapstructure:"database"`
+
+	AllowedOrigins []string `mapstructure:"allowed_origins"`
+}
+
+// Load reads configuration from file and environment variables
+func Load() (*Config, error) {
+	viper.SetConfigName("config")
+	viper.SetConfigType("yaml")
+	viper.AddConfigPath("./config")
+	viper.AddConfigPath(".")
+
+	viper.AutomaticEnv()
+	viper.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
+
+	if err := viper.ReadInConfig(); err != nil {
+		return nil, fmt.Errorf("failed to read config file: %w", err)
+	}
+
+	var cfg Config
+	if err := viper.Unmarshal(&cfg); err != nil {
+		return nil, fmt.Errorf("failed to unmarshal config: %w", err)
+	}
+
+	return &cfg, nil
+}