feat: add Ollama provider support

Add support for Ollama as a provider in CCS, enabling users to use
local Ollama models (qwen3-coder, gpt-oss:20b, gpt-oss:120b) and
Ollama Cloud models (glm-4.7:cloud, qwen3-coder:480b).

Changes:
- Add base-ollama.settings.json for local Ollama (localhost:11434)
- Add base-ollama-cloud.settings.json for ollama.com cloud API
- Add 'ollama' and 'ollama-cloud' presets to provider-presets.ts
- Update help documentation in api-command.ts and help-command.ts

Usage:
  ccs api create --preset ollama          # Local Ollama
  ccs api create --preset ollama-cloud    # Ollama Cloud

Ref: https://github.com/kaitranntt/ccs/issues/353

Co-Authored-By: Claude <noreply@anthropic.com>

src/api/services/provider-presets.ts

@@ -43,6 +43,17 @@ export const PROVIDER_PRESETS: ProviderPreset[] = [
     apiKeyHint: 'Get your API key at openrouter.ai/keys',
     category: 'recommended',
   },
+  {
+    id: 'ollama',
+    name: 'Ollama (Local)',
+    description: 'Local open-source models via Ollama (32K+ context recommended)',
+    baseUrl: 'http://localhost:11434',
+    defaultProfileName: 'ollama',
+    defaultModel: 'qwen3-coder',
+    apiKeyPlaceholder: 'ollama',
+    apiKeyHint: 'Install Ollama from ollama.com - no API key needed for local',
+    category: 'recommended',
+  },
   // Alternative providers
   {
     id: 'glm',
@@ -131,6 +142,17 @@ export const PROVIDER_PRESETS: ProviderPreset[] = [
     apiKeyHint: 'Get your API key from Alibaba Cloud Model Studio',
     category: 'alternative',
   },
+  {
+    id: 'ollama-cloud',
+    name: 'Ollama Cloud',
+    description: 'Ollama.com cloud models (glm-4.7:cloud, qwen3-coder:480b)',
+    baseUrl: 'https://ollama.com',
+    defaultProfileName: 'ollama-cloud',
+    defaultModel: 'glm-4.7:cloud',
+    apiKeyPlaceholder: 'YOUR_OLLAMA_CLOUD_API_KEY',
+    apiKeyHint: 'Get your API key at ollama.com',
+    category: 'alternative',
+  },
 ];
 
 /** Get preset by ID */