refactor(pcre): extract composer/pcre into the shirabe-pcre crate

Move `Composer\Pcre` out of shirabe-external-packages and into its own
crate, so the path is `shirabe_pcre::preg::Preg` instead of
`shirabe_external_packages::composer::pcre::preg::Preg`.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

1 files changed, 4 insertions, 6 deletions

diff --git a/crates/shirabe/src/util/forgejo_url.rs b/crates/shirabe/src/util/forgejo_url.rs
index 639426e1..d2628409 100644
--- a/crates/shirabe/src/util/forgejo_url.rs
+++ b/crates/shirabe/src/util/forgejo_url.rs
@@ -1,6 +1,6 @@
 //! ref: composer/src/Composer/Util/ForgejoUrl.php
 
-use shirabe_external_packages::composer::pcre::Preg;
+use shirabe_pcre::Preg;
 use shirabe_php_shim::InvalidArgumentException;
 
 #[derive(Debug)]
@@ -37,14 +37,12 @@ impl ForgejoUrl {
 
     pub fn try_from(repo_url: Option<&str>) -> Option<Self> {
         let repo_url = repo_url?;
-        let mut matches: indexmap::IndexMap<
-            shirabe_external_packages::composer::pcre::CaptureKey,
-            String,
-        > = indexmap::IndexMap::new();
+        let mut matches: indexmap::IndexMap<shirabe_pcre::CaptureKey, String> =
+            indexmap::IndexMap::new();
         if !Preg::match3(Self::URL_REGEX, repo_url, Some(&mut matches)) {
             return None;
         }
-        use shirabe_external_packages::composer::pcre::CaptureKey;
+        use shirabe_pcre::CaptureKey;
         let m: Vec<String> = (0..5)
             .map(|i| {
                 matches