refactor(domain): Decompose domain.go into individual entity files

Decomposes the monolithic `internal/core/domain/domain.go` file into separate files for each domain entity (`app.go`, `app_instance.go`, `cloudlet.go`, `flavor.go`).

- `SecurityRule` struct moved into `app.go` as it is a value object specific to the App entity.
- `Location` struct moved into `cloudlet.go` as it is a value object specific to the Cloudlet entity.
- `Flavor` remains a separate file as it is a shared entity used by App, AppInstance, and Cloudlet.

This refactoring improves modularity and makes the domain model easier to navigate and understand.

internal/core/domain/app.go

@@ -0,0 +1,31 @@
+package domain
+
+// AppKey uniquely identifies an application
+type AppKey struct {
+	Organization string
+	Name         string
+	Version      string
+}
+
+// App represents an application definition
+type App struct {
+	Key                         AppKey
+	Deployment                  string
+	ImageType                   string
+	ImagePath                   string
+	AllowServerless             bool
+	DefaultFlavor               Flavor
+	ServerlessConfig            interface{}
+	DeploymentGenerator         string
+	DeploymentManifest          string
+	RequiredOutboundConnections []SecurityRule
+	Fields                      []string
+}
+
+// SecurityRule defines network access rules
+type SecurityRule struct {
+	PortRangeMax int
+	PortRangeMin int
+	Protocol     string
+	RemoteCIDR   string
+}

internal/core/domain/app_instance.go

@@ -0,0 +1,18 @@
+package domain
+
+// AppInstanceKey uniquely identifies an application instance
+type AppInstanceKey struct {
+	Organization string
+	Name         string
+	CloudletKey  CloudletKey
+}
+
+// AppInstance represents a deployed application instance
+type AppInstance struct {
+	Key        AppInstanceKey
+	AppKey     AppKey
+	Flavor     Flavor
+	State      string
+	PowerState string
+	Fields     []string
+}

internal/core/domain/cloudlet.go

@@ -0,0 +1,26 @@
+package domain
+
+// CloudletKey uniquely identifies a cloudlet
+type CloudletKey struct {
+	Organization string
+	Name         string
+}
+
+// Cloudlet represents edge infrastructure
+type Cloudlet struct {
+	Key           CloudletKey
+	Location      Location
+	IpSupport     string
+	NumDynamicIps int32
+	State         string
+	Flavor        Flavor
+	PhysicalName  string
+	Region        string
+	NotifySrvAddr string
+}
+
+// Location represents geographical coordinates
+type Location struct {
+	Latitude  float64
+	Longitude float64
+}

internal/core/domain/domain.go

@@ -1,79 +0,0 @@
-
-package domain
-
-// AppKey uniquely identifies an application
-type AppKey struct {
-	Organization string
-	Name         string
-	Version      string
-}
-
-// CloudletKey uniquely identifies a cloudlet
-type CloudletKey struct {
-	Organization string
-	Name         string
-}
-
-// AppInstanceKey uniquely identifies an application instance
-type AppInstanceKey struct {
-	Organization string
-	Name         string
-	CloudletKey  CloudletKey
-}
-
-// Flavor defines resource allocation for instances
-type Flavor struct {
-	Name string
-}
-
-// SecurityRule defines network access rules
-type SecurityRule struct {
-	PortRangeMax int
-	PortRangeMin int
-	Protocol     string
-	RemoteCIDR   string
-}
-
-// App represents an application definition
-type App struct {
-	Key                         AppKey
-	Deployment                  string
-	ImageType                   string
-	ImagePath                   string
-	AllowServerless             bool
-	DefaultFlavor               Flavor
-	ServerlessConfig            interface{}
-	DeploymentGenerator         string
-	DeploymentManifest          string
-	RequiredOutboundConnections []SecurityRule
-	Fields                      []string
-}
-
-// AppInstance represents a deployed application instance
-type AppInstance struct {
-	Key        AppInstanceKey
-	AppKey     AppKey
-	Flavor     Flavor
-	State      string
-	PowerState string
-	Fields     []string
-}
-
-// Cloudlet represents edge infrastructure
-type Cloudlet struct {
-	Key           CloudletKey
-	Location      Location
-	IpSupport     string
-	NumDynamicIps int32
-	State         string
-	Flavor        Flavor
-	PhysicalName  string
-	Region        string
-	NotifySrvAddr string
-}
-
-// Location represents geographical coordinates
-type Location struct {
-	Latitude  float64
-	Longitude float64
-}

internal/core/domain/flavor.go

@@ -0,0 +1,6 @@
+package domain
+
+// Flavor defines resource allocation for instances
+type Flavor struct {
+	Name string
+}