refactor(json): replace seld/jsonlint with serde_json

Validate JSON syntax with serde_json's parse errors in JsonFile, and detect
duplicate keys in ConfigValidator with a hand-written serde visitor, dropping
the now-unused JsonParser/Lexer/DuplicateKeyException ports. ParsingException
is kept as the thrown error type and downcast signal.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

1 files changed, 0 insertions, 25 deletions

diff --git a/crates/shirabe-external-packages/src/seld/json_lint/duplicate_key_exception.rs b/crates/shirabe-external-packages/src/seld/json_lint/duplicate_key_exception.rs
deleted file mode 100644
index 17e6a90..0000000
--- a/crates/shirabe-external-packages/src/seld/json_lint/duplicate_key_exception.rs
+++ /dev/null
@@ -1,25 +0,0 @@
-//! ref: composer/vendor/seld/jsonlint/src/Seld/JsonLint/DuplicateKeyException.php
-
-use indexmap::IndexMap;
-use shirabe_php_shim::PhpMixed;
-
-#[derive(Debug)]
-pub struct DuplicateKeyException {
-    pub message: String,
-    pub code: i64,
-    pub details: IndexMap<String, PhpMixed>,
-}
-
-impl DuplicateKeyException {
-    pub fn get_details(&self) -> &IndexMap<String, PhpMixed> {
-        &self.details
-    }
-}
-
-impl std::fmt::Display for DuplicateKeyException {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        write!(f, "{}", self.message)
-    }
-}
-
-impl std::error::Error for DuplicateKeyException {}