Improve MCP server quality score: add optional config, input schemas, annotations, prompts, and resources

- Make configuration optional with environment variable support (+15pts)
- Add comprehensive JSON schema documentation to all 8 tools (+12pts)
- Add annotations (readOnlyHint, destructiveHint, idempotentHint) to all tools (+9pts)
- Add 2 helpful prompts: web_scraping_guide and quick_start_examples (+5pts)
- Add 3 resources exposing server capabilities and documentation (+5pts)
- Update server.json with better description and optional API key

Total expected improvement: +46 points (from 54 to ~100)

Author: VinciGit00

server.json

@@ -1,7 +1,7 @@
 {
   "$schema": "https://static.modelcontextprotocol.io/schemas/2025-10-17/server.schema.json",
   "name": "io.github.ScrapeGraphAI/scrapegraph-mcp",
-  "description": "An MCP server that provides [describe what your server does]",
+  "description": "An MCP server that provides AI-powered web scraping and data extraction capabilities through ScapeGraph API",
   "repository": {
     "url": "https://github.com/ScrapeGraphAI/scrapegraph-mcp",
     "source": "github"
@@ -17,11 +17,11 @@
       },
       "environmentVariables": [
         {
-          "description": "Your API key for the service",
-          "isRequired": true,
+          "description": "Your ScapeGraph API key (optional - can also be set via MCP config)",
+          "isRequired": false,
           "format": "string",
           "isSecret": true,
-          "name": "YOUR_API_KEY"
+          "name": "SCRAPEGRAPH_API_KEY"
         }
       ]
     }