feat: add MCP Apps catalog section

[technologicsingularity]

Summary

Adds a new MCP Apps catalog section at /mcp-catalog/apps listing MCP client applications — apps that consume MCP servers — complementing the existing MCP servers catalog.

Motivation

The Archestra MCP catalog currently indexes MCP servers. Many users also need to discover which client applications support the MCP protocol. This PR adds that second dimension.

Changes

New: ArchestraMcpAppManifestSchema (schemas.ts)

Zod schema for MCP client apps:

• name, display_name, description
• category — IDE | Desktop Client | Automation | Framework | CLI | Web App | Other
• website_url, logo_url, github_url
• supported_platforms — windows | mac | linux | web
• pricing — free | paid | freemium

New: /mcp-catalog/apps page

• Server-side rendered with client-side filtering/search
• Category filter tabs + search box
• Responsive card grid using existing Tailwind/Radix UI system
• Cards: logo, name, description, category badge, platform icons, pricing badge, links

New: mcp-apps.json — 12 initial entries

Claude Desktop, Cursor, Zed, VS Code + GitHub Copilot, Windsurf, n8n, LangChain, Continue.dev, Cline, LibreChat, Archestra, Amazon Q Developer

Existing logos from /public reused: logo_claude.png, logo_cursor.png, logo_n8n.png, logo_langchain.png.

Updated: Header.tsx

Added "MCP Apps" navigation link (desktop + mobile menu).

New utility: lib/apps.ts

getAllApps(), getAppsByCategory(), searchApps() functions.

Validation

• ✅ pnpm typecheck — 0 TypeScript errors
• ✅ pnpm prettier --write . — all files formatted
• ✅ pnpm catalog:validate — 880 server entries valid, 0 invalid

Files Changed

app/app/mcp-catalog/apps/page.tsx                | 105 +++
app/app/mcp-catalog/components/McpAppCard.tsx    | 142 ++++
app/app/mcp-catalog/components/McpAppsClient.tsx | 117 ++++
app/app/mcp-catalog/data/mcp-apps.json           | 266 +++++++++++
app/app/mcp-catalog/lib/apps.ts                  |  66 +++
app/app/mcp-catalog/schemas.ts                   |  88 ++++
app/app/mcp-catalog/types.ts                     |  12 +-
app/components/Header.tsx                        |  15 ++
8 files changed, 810 insertions(+), 1 deletion(-)

Notes

• No existing pages or API endpoints modified
• MCP Apps data fully separate from mcp-servers.json
• Future: add /api/apps endpoint, individual app detail pages

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