feat: Add interactive packet documentation system

- Create JSON-based packet documentation for 145 packets (66 incoming, 79 outgoing)
- Add HTML template with search, filtering, and navigation
- Support enum/bitfield field display with values and descriptions
- Support packet variants for version-specific structures
- Include 0xBF extended command subpackets documentation
- Add PowerShell build script to generate final HTML

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Distribution/Data/packets/outgoing/items.json

@@ -0,0 +1,35 @@
+{
+  "category": "Items",
+  "packets": [
+    {
+      "id": "0x1A",
+      "name": "World Item",
+      "description": "Displays an item in the world (pre-Stygian Abyss clients).",
+      "direction": "outgoing",
+      "isDynamic": true,
+      "size": "Dynamic (14-20 bytes)",
+      "fields": [
+        { "name": "packetId", "type": "byte", "size": 1, "value": "0x1A", "description": "Packet identifier" },
+        { "name": "length", "type": "ushort", "size": 2, "description": "Packet length (14-20)" },
+        { "name": "serial", "type": "uint", "size": 4, "description": "Item serial (bit 31 set if amount present)" },
+        { "name": "itemId", "type": "ushort", "size": 2, "description": "Item graphic ID (bit 14 set for multi)" },
+        { "name": "amount", "type": "ushort", "size": 2, "description": "Stack amount (if serial bit 31 set)", "condition": "serial & 0x80000000" },
+        { "name": "x", "type": "ushort", "size": 2, "description": "X coordinate (bit 15 set if direction present)" },
+        { "name": "y", "type": "ushort", "size": 2, "description": "Y coordinate (bit 15=hue, bit 14=flags)" },
+        { "name": "direction", "type": "byte", "size": 1, "description": "Direction (if x bit 15 set)", "condition": "x & 0x8000" },
+        { "name": "z", "type": "sbyte", "size": 1, "description": "Z coordinate" },
+        { "name": "hue", "type": "ushort", "size": 2, "description": "Item hue (if y bit 15 set)", "condition": "y & 0x8000" },
+        { "name": "flags", "type": "byte", "size": 1, "description": "Packet flags (if y bit 14 set)", "condition": "y & 0x4000" }
+      ],
+      "notes": "For Stygian Abyss+ clients, use 0xF3 World Entity instead.",
+      "clientVersion": {
+        "max": "6.0.14.2",
+        "notes": "Replaced by 0xF3 for SA+ clients"
+      },
+      "source": {
+        "file": "Projects/Server/Network/Packets/OutgoingItemPackets.cs",
+        "line": 24
+      }
+    }
+  ]
+}