fix: add scoped error logging for lexer/parser errors

- Add std.log.scoped(.pugz) to template.zig and view_engine.zig
- Log detailed error info (code, line, column, message) when parsing fails
- Log template path context in ViewEngine on parse errors
- Remove debug print from lexer, use proper scoped logging instead
- Move benchmarks, docs, examples, playground, tests out of src/ to project root
- Update build.zig and documentation paths accordingly
- Bump version to 0.3.1

benchmarks/pugjs/package.json

@@ -0,0 +1,12 @@
+{
+  "name": "pugjs-benchmark",
+  "version": "1.0.0",
+  "description": "Pug.js benchmark for comparison with Pugz",
+  "main": "bench.js",
+  "scripts": {
+    "bench": "node bench.js"
+  },
+  "dependencies": {
+    "pug": "^3.0.3"
+  }
+}