feat(ui): add skills pane in left nav and wire skills api/service

app/api/skills/[name]/route.ts

@@ -0,0 +1,52 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { readSkill, deleteSkill } from '@/services/skills/skillService';
+
+export const runtime = 'nodejs';
+
+export async function GET(
+  _request: NextRequest,
+  { params }: { params: Promise<{ name: string }> }
+) {
+  try {
+    const { name } = await params;
+    const skill = readSkill(name);
+    if (!skill) {
+      return NextResponse.json(
+        { success: false, error: `Skill "${name}" not found` },
+        { status: 404 }
+      );
+    }
+
+    return NextResponse.json({ success: true, data: skill });
+  } catch (error) {
+    console.error('[API /skills/[name]] error:', error);
+    return NextResponse.json(
+      { success: false, error: error instanceof Error ? error.message : 'Failed to read skill' },
+      { status: 500 }
+    );
+  }
+}
+
+export async function DELETE(
+  _request: NextRequest,
+  { params }: { params: Promise<{ name: string }> }
+) {
+  try {
+    const { name } = await params;
+    const result = deleteSkill(name);
+    if (!result.success) {
+      return NextResponse.json(
+        { success: false, error: result.error },
+        { status: 400 }
+      );
+    }
+
+    return NextResponse.json({ success: true, message: `Skill "${name}" deleted` });
+  } catch (error) {
+    console.error('[API /skills/[name] DELETE] error:', error);
+    return NextResponse.json(
+      { success: false, error: error instanceof Error ? error.message : 'Failed to delete skill' },
+      { status: 500 }
+    );
+  }
+}