Feat/deepseek chat node (#3732)

* Feat: Add deepseek models to components configuration

* Feat: Implement Deepseek API integration with chat models and add SVG icon

* Refactor: Remove image input options and add missing baseOptions in deepseek chat node

packages/components/credentials/DeepseekApi.credential.ts

@@ -0,0 +1,23 @@
+import { INodeCredential, INodeParams } from '../src/Interface'
+
+class DeepseekApi implements INodeCredential {
+    label: string
+    name: string
+    version: number
+    inputs: INodeParams[]
+
+    constructor() {
+        this.label = 'DeepseekAI API'
+        this.name = 'deepseekApi'
+        this.version = 1.0
+        this.inputs = [
+            {
+                label: 'DeepseekAI API Key',
+                name: 'deepseekApiKey',
+                type: 'password'
+            }
+        ]
+    }
+}
+
+module.exports = { credClass: DeepseekApi }