feat: improve direct model workspace tools

Direct models now use bundled ripgrep for workspace discovery, read files through resumable pages, and edit multiple files with apply_patch. Ask can search and read while Execute retains write access, and fixed total input limits no longer constrain these tools.

Release note: 直连模型现可使用随包 ripgrep 搜索项目、分页读取任意大小的文本，并通过多文件补丁修改代码；设置中的相关能力统一显示为工作区文件和开发工具。

src/main/agent/bundled-runtimes.test.ts

@@ -8,7 +8,8 @@ describe('bundled runtime paths', () => {
       appPath: join('workspace', 'app'),
       resourcesPath: join('electron', 'resources'),
       packaged: false,
-      platform: 'linux'
+      platform: 'linux',
+      arch: 'x64'
     })
 
     expect(paths).toEqual({
@@ -20,6 +21,15 @@ describe('bundled runtime paths', () => {
         'bin',
         'opencode.exe'
       ),
+      ripgrep: join(
+        'workspace',
+        'app',
+        'node_modules',
+        '@vscode',
+        'ripgrep-linux-x64',
+        'bin',
+        'rg'
+      ),
       continue: join(
         'workspace',
         'app',
@@ -61,6 +71,13 @@ describe('bundled runtime paths', () => {
         'runtimes',
         'opencode-config'
       ),
+      ripgrep: join(
+        'installed',
+        'resources',
+        'runtimes',
+        'opencode',
+        'rg.exe'
+      ),
       continue: join(
         'installed',
         'resources',