refactor(dashboard,acp): rename /dashboard/agents → /dashboard/acp-agents + use shared concept/comparison cards (plan 14 F7)

- git mv agents/ → acp-agents/ (preserves history)
- useTranslations("agents") → useTranslations("acpAgents")
- Replace inline architecture/comparison cards with <CliConceptCard currentType="acp" /> + <CliComparisonCard currentType="acp" />
- Update all cross-links from /dashboard/cli-tools → /dashboard/cli-code
- Update cliToolsRedirectCta/openCliTools keys → cliCodeRedirectCta
- Update sidebarVisibility: id "agents" → "acp-agents", href "/dashboard/agents" → "/dashboard/acp-agents", i18nKey "agents" → "acpAgents"
- Update HIDEABLE_SIDEBAR_ITEM_IDS and DEVELOPER_SHOWN preset: "agents" → "acp-agents"
- Add tests/unit/ui/AcpAgentsPage.test.tsx (6 vitest tests: smoke, namespace, concept card, comparison card, cross-link, agent grid)

src/shared/constants/sidebarVisibility.ts

@@ -14,7 +14,7 @@ export const HIDEABLE_SIDEBAR_ITEM_IDS = [
   "context-combos",
   // OmniProxy > Tools
   "cli-tools",
-  "agents",
+  "acp-agents",
   "cloud-agents",
   // OmniProxy > Integrations
   "api-endpoints",
@@ -236,10 +236,10 @@ const TOOLS_GROUP: SidebarItemGroup = {
       icon: "terminal",
     },
     {
-      id: "agents",
-      href: "/dashboard/agents",
-      i18nKey: "agents",
-      subtitleKey: "agentsSubtitle",
+      id: "acp-agents",
+      href: "/dashboard/acp-agents",
+      i18nKey: "acpAgents",
+      subtitleKey: "acpAgentsSubtitle",
       icon: "smart_toy",
     },
     {
@@ -802,7 +802,7 @@ const DEVELOPER_SHOWN: ReadonlySet<HideableSidebarItemId> = new Set([
   "context-rtk",
   "context-combos",
   "cli-tools",
-  "agents",
+  "acp-agents",
   "api-endpoints",
   "analytics",
   "analytics-combo-health",