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/libcore/include/core_stream.h

@@ -9,7 +9,7 @@
 struct scc_probe_stream;
 typedef struct scc_probe_stream scc_probe_stream_t;
 
-#define core_stream_eof (-1)
+#define scc_stream_eof (-1)
 
 /**
  * @brief 带探针的流接口
@@ -113,8 +113,8 @@ typedef struct scc_mem_probe_stream {
  * @return core_probe_stream_t* 成功返回流指针，失败返回NULL
  */
 scc_probe_stream_t *scc_mem_probe_stream_init(scc_mem_probe_stream_t *stream,
-                                             const char *data, usize length,
-                                             cbool need_copy);
+                                              const char *data, usize length,
+                                              cbool need_copy);
 #endif
 
 #endif /* __SMCC_CORE_PROBE_STREAM_H__ */