reorganize: consolidate demo directories

- Consolidate _demo, _pydemo, _embdemo into single _demo directory structure
- Organize demos by language: _demo/{go,py,c,embed}/
- Categorize demos based on imports:
- Python library demos (py imports) → _demo/py/
- C/C++ library demos (c/cpp imports) → _demo/c/
- Go-specific demos → _demo/go/
- Embedded demos → _demo/embed/
- Move C-related demos (asm*, cabi*, cgo*, linkname, targetsbuild) from go/ to c/
- Update all path references in README.md and GitHub workflows
- Improve demo organization and navigation as requested in #1256

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

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

_demo/go/defer/main.go

@@ -0,0 +1,18 @@
+package main
+
+func main() {
+	var a int = 5
+	defer println(a)
+	defer func() {
+		println(a)
+	}()
+	defer func() {
+		println(recover().(string))
+	}()
+	a = 10
+	panic("error")
+	//Output:
+	// error
+	// 10
+	// 5
+}