fix(sccf): 修复符号构建器中的字符串处理逻辑

在sccf_builder_add_symbol函数中修正了字符串键的使用方式，
直接使用传入的name参数而不是从字符串表中获取，
避免了潜在的内存访问问题并简化了代码逻辑。

libs/sccf/src/sccf_builder.c

@@ -9,6 +9,7 @@ void sccf_builder_init(sccf_builder_t *builder) {
     scc_hashtable_init(&builder->str2sym,
                        (scc_hashtable_hash_func_t)scc_strhash32,
                        (scc_hashtable_equal_func_t)scc_strcmp);
+
     scc_vec_init(builder->strtab);
     scc_vec_init(builder->relocs);
     scc_vec_init(builder->symtab);
@@ -25,7 +26,7 @@ usize sccf_builder_add_symbol(sccf_builder_t *builder, const char *name,
                               sccf_sym_t *sym) {
     usize offset = 0;
     offset = (usize)scc_hashtable_get(&builder->str2offset, name);
-    const char *key = &scc_vec_at(builder->strtab, offset);
+    const char *key = name;
     if (offset == 0) {
         offset = scc_vec_size(builder->strtab);
         while (*name) {
@@ -34,7 +35,6 @@ usize sccf_builder_add_symbol(sccf_builder_t *builder, const char *name,
         }
         scc_vec_push(builder->strtab, '\0');
 
-        key = &scc_vec_at(builder->strtab, offset);
         scc_hashtable_set(&builder->str2offset, key, (void *)offset);
     }
     sym->name_offset = offset;