add yml config file, client now does not depends on .env

template/darwin.yaml

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+# nexus-sync client config template for macOS/Darwin
+server_url: "http://127.0.0.1:5852"
+client_id: "darwin-client"
+client_token: "change-me-client-token"
+allowed_commands:
+  - name: hostname
+    description: "Get the hostname of the client machine"
+    cmd: "hostname"
+  - name: network_interfaces
+    description: "Get network interface information"
+    cmd: "ifconfig"
+logging_level: "INFO"

template/linux.yaml

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+# nexus-sync client config template for Linux
+server_url: "http://127.0.0.1:5852"
+client_id: "linux-client"
+client_token: "change-me-client-token"
+allowed_commands:
+  - name: hostname
+    description: "Get the hostname of the client machine"
+    cmd: "hostname"
+  - name: network_interfaces
+    description: "Get network interface information"
+    cmd: "ip addr show"
+logging_level: "INFO"

template/windows.yaml

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+# nexus-sync client config template for Windows
+server_url: "http://127.0.0.1:5852"
+client_id: "windows-client"
+client_token: "change-me-client-token"
+allowed_commands:
+  - name: hostname
+    description: "Get the hostname of the client machine"
+    cmd: "hostname"
+  - name: network_interfaces
+    description: "Get network interface information"
+    cmd: "ipconfig /all"
+logging_level: "INFO"