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/c/cgofull/foo.go

@@ -0,0 +1,16 @@
+package main
+
+/*
+#cgo CFLAGS: -DFOO
+#include <stdio.h>
+#include "foo.h"
+static void foo(Foo* f) {
+	printf("foo in bar: %d\n", f->a);
+}
+*/
+import "C"
+
+func Foo(f *C.Foo) {
+	C.print_foo(f)
+	C.foo(f)
+}