feat(core): declare module structure

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

crates/core/src/parser/json.rs

@@ -0,0 +1,8 @@
+use crate::types::LogEntry;
+
+pub fn parse_line(_line: &str) -> Option<LogEntry> {
+    todo!()
+}
+pub fn detect_json_log(_line: &str) -> bool {
+    todo!()
+}

crates/core/src/parser/mod.rs

@@ -0,0 +1 @@
+pub mod json;