feat(mcp): add parallel-search server catalog entry (#2085)

* feat(mcp): add parallel-search server catalog entry

* fix(mcp): drop placeholder Bearer header from parallel-search entry

The /mcp endpoint accepts anonymous requests by default; baking in a
placeholder "Authorization: Bearer YOUR_PARALLEL_API_KEY_HERE" header
breaks the key-free default for users who copy the entry verbatim.
Move the optional API-key guidance into the description instead.

mcp-configs/mcp-servers.json

@@ -99,6 +99,11 @@
       },
       "description": "Web search, research, and data ingestion via Exa API — prefer task-scoped use for broader research after GitHub search and primary docs"
     },
+    "parallel-search": {
+      "type": "http",
+      "url": "https://search.parallel.ai/mcp",
+      "description": "Parallel Web Search — LLM-optimized web_search and web_fetch tools that take an objective + queries and return citation-backed excerpts in a single call (replaces multiple keyword searches). Works key-free for anonymous use. For higher rate limits, add a headers block: { \"Authorization\": \"Bearer YOUR_PARALLEL_API_KEY_HERE\" } using a key from platform.parallel.ai."
+    },
     "context7": {
       "command": "npx",
       "args": ["-y", "@upstash/context7-mcp@latest"],