feat: Add support for Ollama embeddings API (#8732)

Signed-off-by: Oleg Ivaniv <me@olegivaniv.com>
Co-authored-by: Oleg Ivaniv <me@olegivaniv.com>

packages/@n8n/nodes-langchain/nodes/llms/LMOllama/description.ts

@@ -0,0 +1,101 @@
+import type { INodeProperties, INodeTypeDescription } from 'n8n-workflow';
+
+export const ollamaDescription: Partial<INodeTypeDescription> = {
+	credentials: [
+		{
+			name: 'ollamaApi',
+			required: true,
+		},
+	],
+	requestDefaults: {
+		ignoreHttpStatusErrors: true,
+		baseURL: '={{ $credentials.baseUrl.replace(new RegExp("/$"), "") }}',
+	},
+};
+
+export const ollamaModel: INodeProperties = {
+	displayName: 'Model',
+	name: 'model',
+	type: 'options',
+	default: 'llama2',
+	description:
+		'The model which will generate the completion. To download models, visit <a href="https://ollama.ai/library">Ollama Models Library</a>.',
+	typeOptions: {
+		loadOptions: {
+			routing: {
+				request: {
+					method: 'GET',
+					url: '/api/tags',
+				},
+				output: {
+					postReceive: [
+						{
+							type: 'rootProperty',
+							properties: {
+								property: 'models',
+							},
+						},
+						{
+							type: 'setKeyValue',
+							properties: {
+								name: '={{$responseItem.name}}',
+								value: '={{$responseItem.name}}',
+							},
+						},
+						{
+							type: 'sort',
+							properties: {
+								key: 'name',
+							},
+						},
+					],
+				},
+			},
+		},
+	},
+	routing: {
+		send: {
+			type: 'body',
+			property: 'model',
+		},
+	},
+	required: true,
+};
+
+export const ollamaOptions: INodeProperties = {
+	displayName: 'Options',
+	name: 'options',
+	placeholder: 'Add Option',
+	description: 'Additional options to add',
+	type: 'collection',
+	default: {},
+	options: [
+		{
+			displayName: 'Sampling Temperature',
+			name: 'temperature',
+			default: 0.7,
+			typeOptions: { maxValue: 1, minValue: 0, numberPrecision: 1 },
+			description:
+				'Controls randomness: Lowering results in less random completions. As the temperature approaches zero, the model will become deterministic and repetitive.',
+			type: 'number',
+		},
+		{
+			displayName: 'Top K',
+			name: 'topK',
+			default: -1,
+			typeOptions: { maxValue: 1, minValue: -1, numberPrecision: 1 },
+			description:
+				'Used to remove "long tail" low probability responses. Defaults to -1, which disables it.',
+			type: 'number',
+		},
+		{
+			displayName: 'Top P',
+			name: 'topP',
+			default: 1,
+			typeOptions: { maxValue: 1, minValue: 0, numberPrecision: 1 },
+			description:
+				'Controls diversity via nucleus sampling: 0.5 means half of all likelihood-weighted options are considered. We generally recommend altering this or temperature but not both.',
+			type: 'number',
+		},
+	],
+};