docs(mcp): cross-link MCP server setup guide from openapi.json

Adds a short MCP Server section to info.description noting that POST /mcp
is a JSON-RPC 2.0 / Model Context Protocol endpoint. MCP is self-describing
at runtime via tools/list, so the canonical reference is the customer-facing
setup guide at /sdks/mcp rather than an OpenAPI path entry.

Same pattern as the WebSocket cross-link added in the previous commit —
keeps the spec self-aware about what isn't covered.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: Mlaz-code

public/openapi.json

@@ -3,7 +3,7 @@
   "info": {
     "title": "SharpAPI",
     "version": "2.0.0",
-    "description": "Real-time sports betting odds API with +EV detection, arbitrage, middles, and low-hold opportunities.\n\n## Authentication\n\nAll authenticated endpoints accept an API key via one of three methods:\n\n| Method | Header / Param | Use case |\n|--------|---------------|----------|\n| `X-API-Key` | `X-API-Key: sk_live_...` | Recommended for server-side |\n| `Authorization` | `Authorization: Bearer sk_live_...` | Standard Bearer token |\n| `api_key` query | `?api_key=sk_live_...` | SSE/EventSource (cannot set headers) |\n\n## Subscription Tiers\n\n| Tier | Rate Limit | Data Delay | Max Books | EV | Arb | Middles | Game State |\n|------|-----------|------------|-----------|-----|-----|---------|------------|\n| Free | 12/min | 60s | 2 (DK, FD) | - | - | - | - |\n| Hobby | 120/min | Real-time | 5 | - | Yes | - | - |\n| Pro | 300/min | Real-time | 15 | Yes | Yes | Yes | - |\n| Sharp | 1000/min | Real-time | All | Yes | Yes | Yes | - |\n| Enterprise | Custom | Real-time | All | Yes | Yes | Yes | Yes |\n\n## Rate Limit Headers\n\nEvery authenticated response includes:\n\n- `X-RateLimit-Limit` - Requests allowed per minute\n- `X-RateLimit-Remaining` - Requests remaining in current window\n- `X-RateLimit-Reset` - Unix timestamp when the window resets\n- `X-Data-Delay` - Odds delay in seconds for your tier (0 = real-time)\n- `X-Request-Id` - Unique request identifier for support\n\n## WebSocket Streaming\n\nThe WebSocket endpoint at `wss://ws.sharpapi.io` is documented separately in [`asyncapi.yaml`](./asyncapi.yaml) (AsyncAPI 3.0). OpenAPI 3.x cannot express WebSocket subprotocols and message channels, so the SSE endpoint (`/stream`) is the only stream covered by this document.\n",
+    "description": "Real-time sports betting odds API with +EV detection, arbitrage, middles, and low-hold opportunities.\n\n## Authentication\n\nAll authenticated endpoints accept an API key via one of three methods:\n\n| Method | Header / Param | Use case |\n|--------|---------------|----------|\n| `X-API-Key` | `X-API-Key: sk_live_...` | Recommended for server-side |\n| `Authorization` | `Authorization: Bearer sk_live_...` | Standard Bearer token |\n| `api_key` query | `?api_key=sk_live_...` | SSE/EventSource (cannot set headers) |\n\n## Subscription Tiers\n\n| Tier | Rate Limit | Data Delay | Max Books | EV | Arb | Middles | Game State |\n|------|-----------|------------|-----------|-----|-----|---------|------------|\n| Free | 12/min | 60s | 2 (DK, FD) | - | - | - | - |\n| Hobby | 120/min | Real-time | 5 | - | Yes | - | - |\n| Pro | 300/min | Real-time | 15 | Yes | Yes | Yes | - |\n| Sharp | 1000/min | Real-time | All | Yes | Yes | Yes | - |\n| Enterprise | Custom | Real-time | All | Yes | Yes | Yes | Yes |\n\n## Rate Limit Headers\n\nEvery authenticated response includes:\n\n- `X-RateLimit-Limit` - Requests allowed per minute\n- `X-RateLimit-Remaining` - Requests remaining in current window\n- `X-RateLimit-Reset` - Unix timestamp when the window resets\n- `X-Data-Delay` - Odds delay in seconds for your tier (0 = real-time)\n- `X-Request-Id` - Unique request identifier for support\n\n## WebSocket Streaming\n\nThe WebSocket endpoint at `wss://ws.sharpapi.io` is documented separately in [`asyncapi.yaml`](./asyncapi.yaml) (AsyncAPI 3.0). OpenAPI 3.x cannot express WebSocket subprotocols and message channels, so the SSE endpoint (`/stream`) is the only stream covered by this document.\n\n## MCP Server\n\nThe `POST /mcp` endpoint is a Model Context Protocol server (JSON-RPC 2.0 over Streamable HTTP). Tools are self-described at runtime via `tools/list`, so it's documented as a setup guide rather than an OpenAPI path \u2014 see [`/sdks/mcp`](https://docs.sharpapi.io/sdks/mcp).\n",
     "contact": {
       "name": "SharpAPI Support",
       "url": "https://sharpapi.io",