Create web directory with test fixtures

- Added new web/ directory for frontend development
- Created fixtures/ subdirectory with JSON test data
- Added samples for all major packet types (text, position, nodeinfo, etc.)
- Added README files with documentation
- Added placeholder package.json

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

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

web/package.json

@@ -0,0 +1,18 @@
+{
+  "name": "meshstream-web",
+  "version": "0.1.0",
+  "description": "Web application for visualizing Meshtastic network data",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "start": "echo \"Error: no start script specified\" && exit 1"
+  },
+  "keywords": [
+    "meshtastic",
+    "mesh",
+    "network",
+    "visualization"
+  ],
+  "author": "",
+  "license": "MIT"
+}