feat(parser): 添加语义分析回调清理函数并完善资源管理

添加了 scc_sema_drop 函数用于清理语义分析回调结构，
并在主程序中正确初始化和释放语义分析回调，
确保资源得到适当管理。

同时修复了AST转储中的缩进问题，在函数调用括号前添加正确的缩进，
并修正了测试代码中的结构体字段初始化顺序。

libs/ast/src/ast_dump.c

@@ -355,7 +355,9 @@ static void dump_type_impl(scc_ast_type_t *type, scc_tree_dump_ctx_t *ctx) {
                 dump_type_impl(param->param.type, ctx);
             }
         } else {
+            scc_tree_print_indent(ctx);
             PRINT_QUOTED_VALUE(ctx, "()");
+            scc_tree_dump_printf(ctx, "\n");
         }
         scc_vec_pop(ctx->stack);
         break;

libs/parser/include/scc_sema.h

@@ -24,5 +24,6 @@ typedef struct scc_sema_callbacks {
 } scc_sema_callbacks_t;
 
 void scc_sema_init(scc_sema_callbacks_t *callbacks);
+void scc_sema_drop(scc_sema_callbacks_t *callbacks);
 
 #endif /* __SCC_SEMA_H__ */

libs/parser/src/scc_sema.c

@@ -14,3 +14,5 @@ void scc_sema_init(scc_sema_callbacks_t *callbacks) {
     callbacks->on_type = null;
     callbacks->got_type = null;
 }
+
+void scc_sema_drop(scc_sema_callbacks_t *callbacks) {}

libs/parser/tests/test_parser_unit.c

@@ -1123,6 +1123,8 @@ static void test_parser_type(void) {
         scc_ast_type_t struct_type;
         scc_ast_type_struct_init(&struct_type, null, &struct_def);
         SCC_CHECK_AST(&struct_type.base, "struct { int x; }", _scc_parse_type);
+        scc_vec_init(fields);
+        scc_vec_push(fields, &field);
         scc_ast_decl_struct_init(&struct_def, "A", &fields);
         scc_ast_type_struct_init(&struct_type, "A", &struct_def);
         SCC_CHECK_AST(&struct_type.base, "struct A { int x; }",

src/main.c

@@ -271,14 +271,17 @@ int main(int argc, const char **argv, const char **envp) {
 
     scc_lexer_tok_ring_t *tok_ring = scc_pproc_to_ring(&pproc, 8, false, false);
     scc_parser_t parser;
-    scc_parser_init(&parser, tok_ring, null);
+    scc_sema_callbacks_t sema_callbacks;
+    scc_sema_init(&sema_callbacks);
+    scc_parser_init(&parser, tok_ring, &sema_callbacks);
     scc_ast_translation_unit_t *translation_unit =
         scc_parse_translation_unit(&parser);
 
-    // scc_parser_drop(&parser);
+    scc_sema_drop(&sema_callbacks);
-    // scc_pproc_drop(&pproc);
+    scc_parser_drop(&parser);
-    // scc_lexer_drop(&lexer);
+    scc_pproc_drop(&pproc);
-    // scc_sstream_drop(&sstream);
+    scc_lexer_drop(&lexer);
+    scc_sstream_drop(&sstream);
 
     if (config.emit_ast) {
         scc_tree_dump_ctx_t tree_dump;