feat(models): implement custom model support for ollama/openrouter

Adds the ability for users to specify custom model IDs for Ollama and OpenRouter providers, bypassing the internal supported model list.

    - Introduces --ollama and --openrouter flags for the 'task-master models --set-<role>' command.
    - Updates the interactive 'task-master models --setup' to include options for entering custom Ollama/OpenRouter IDs.
    - Implements live validation against the OpenRouter API when a custom OpenRouter ID is provided.
    - Refines the model setting logic to prioritize explicit provider flags/choices.
    - Adds warnings when custom models are set.
    - Updates the changeset file.

mcp-server/src/tools/models.js

@@ -46,7 +46,15 @@ export function registerModelsTool(server) {
 			projectRoot: z
 				.string()
 				.optional()
-				.describe('The directory of the project. Must be an absolute path.')
+				.describe('The directory of the project. Must be an absolute path.'),
+			openrouter: z
+				.boolean()
+				.optional()
+				.describe('Indicates the set model ID is a custom OpenRouter model.'),
+			ollama: z
+				.boolean()
+				.optional()
+				.describe('Indicates the set model ID is a custom Ollama model.')
 		}),
 		execute: async (args, { log, session }) => {
 			try {