Add built-in HTTP server pattern (JDK 18, jwebserver)

Shows jwebserver CLI and SimpleFileServer API vs external server setup.
Inserted between compact-object-headers and aot-class-preloading. 90 snippets.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: brunoborges

content/tooling/aot-class-preloading.json

@@ -34,7 +34,7 @@
     "state": "experimental",
     "description": "Available in JDK 25 LTS (JEPs 514/515, Sept 2025). Experimental."
   },
-  "prev": "tooling/compact-object-headers",
+  "prev": "tooling/built-in-http-server",
   "next": "language/default-interface-methods",
   "related": [
     "tooling/jshell-prototyping",

content/tooling/built-in-http-server.json

@@ -0,0 +1,32 @@
+{
+  "id": 91,
+  "slug": "built-in-http-server",
+  "title": "Built-in HTTP server",
+  "category": "tooling",
+  "difficulty": "beginner",
+  "jdkVersion": "18",
+  "oldLabel": "Java 8",
+  "modernLabel": "Java 18+",
+  "oldApproach": "External Server / Framework",
+  "modernApproach": "jwebserver CLI",
+  "oldCode": "// Install and configure a web server\n// (Apache, Nginx, or embedded Jetty)\n\n// Or write boilerplate with com.sun.net.httpserver\nHttpServer server = HttpServer.create(\n    new InetSocketAddress(8080), 0);\nserver.createContext(\"/\", exchange -> { ... });\nserver.start();",
+  "modernCode": "// Terminal: serve current directory\n$ jwebserver\n\n// Or use the API (JDK 18+)\nvar server = SimpleFileServer.createFileServer(\n    new InetSocketAddress(8080),\n    Path.of(\".\"),\n    OutputLevel.VERBOSE);\nserver.start();",
+  "summary": "Java 18 includes a built-in minimal HTTP server for prototyping and file serving.",
+  "explanation": "JDK 18 added a simple, zero-dependency HTTP file server accessible via the jwebserver command-line tool or the SimpleFileServer API. It serves static files from a given directory with no configuration needed. The CLI tool is ideal for quick prototyping, testing, and ad-hoc file sharing — no external dependencies or frameworks required. The API allows programmatic use with customizable handlers and output levels.",
+  "whyModernWins": [
+    { "icon": "🚀", "title": "Zero setup", "desc": "Run jwebserver in any directory — no installation, config, or dependencies needed." },
+    { "icon": "📦", "title": "Built into the JDK", "desc": "Ships with every JDK 18+ installation, always available on any machine with Java." },
+    { "icon": "🧪", "title": "Great for prototyping", "desc": "Serve static files instantly for testing HTML, APIs, or front-end development." }
+  ],
+  "support": {
+    "state": "available",
+    "description": "Available since JDK 18 (March 2022)"
+  },
+  "prev": "tooling/compact-object-headers",
+  "next": "tooling/aot-class-preloading",
+  "related": [
+    "io/http-client",
+    "tooling/single-file-execution",
+    "tooling/jshell-prototyping"
+  ]
+}

content/tooling/compact-object-headers.json

@@ -35,7 +35,7 @@
     "description": "Finalized in JDK 25 LTS (JEP 519, Sept 2025)."
   },
   "prev": "tooling/jfr-profiling",
-  "next": "tooling/aot-class-preloading",
+  "next": "tooling/built-in-http-server",
   "related": [
     "tooling/jshell-prototyping",
     "tooling/single-file-execution",