feat(lex_parser): rename functions and update header guard prefix

- Change header guard from `__SMCC_LEX_PARSER_H__` to `__SCC_LEX_PARSER_H__`
- Prefix all lexer functions with `scc_` (e.g., `lex_parse_char` → `scc_lex_parse_char`)
- Add new helper function `scc_lex_parse_is_identifier_header`
- Update references in source and test files to use new function names
- Replace `core_stream_eof` with `scc_stream_eof` for consistency

runtime/libutils/src/hashmap.c

@@ -142,12 +142,12 @@ void scc_hashtable_drop(scc_hashtable_t *ht) {
     ht->tombstone_count = 0;
 }
 
-void scc_hashmap_foreach(scc_hashtable_t *ht, scc_hashtable_iter_fn iter_func,
-                         void *context) {
+void scc_hashtable_foreach(scc_hashtable_t *ht, scc_hashtable_iter_fn iter_func,
+                           void *context) {
     for (usize i = 0; i < ht->entries.cap; i++) {
         scc_hashtable_entry_t *entry = &scc_vec_at(ht->entries, i);
         if (entry->state == ENTRY_ACTIVE) {
-            if (!iter_func(entry->key, entry->value, context)) {
+            if (iter_func(entry->key, entry->value, context)) {
                 break; // enable callback function terminal the iter
             }
         }