feat: 泛型基础设施 — <T>解析 + 类型推断 (单态化 codegen 待补)

src/ast/ast.c

@@ -31,13 +31,16 @@ AstNode* ast_make_program(void* alloc, AstNode** fns, size_t fn_count,
 
 AstNode* ast_make_function(void* alloc, const char* name, AstNode** params, size_t pcount,
                            TypeKind ret, const char* ret_struct_name, AstNode* body,
-                           bool is_pub, SourceLoc loc) {
+                           bool is_pub, const char** type_params, size_t tp_count,
+                           SourceLoc loc) {
     NEW(alloc, AST_FUNCTION);
     n->as.function.name = name; n->as.function.params = params;
     n->as.function.param_count = pcount; n->as.function.return_type = ret;
     n->as.function.return_struct_type_name = ret_struct_name;
     n->as.function.body = body;
     n->as.function.is_pub = is_pub;
+    n->as.function.type_params = type_params;
+    n->as.function.type_param_count = tp_count;
     return n;
 }