refactor(crates): split metadata-minifier and spdx-licenses into own crates

Move MetadataMinifier and SpdxLicenses out of shirabe-external-packages
into dedicated shirabe-metadata-minifier and shirabe-spdx-licenses
crates, updating all import sites accordingly.

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

3 files changed, 43 insertions, 0 deletions

diff --git a/crates/shirabe-spdx-licenses/Cargo.toml b/crates/shirabe-spdx-licenses/Cargo.toml
new file mode 100644
index 0000000..a1bd9bb
--- /dev/null
+++ b/crates/shirabe-spdx-licenses/Cargo.toml
@@ -0,0 +1,10 @@
+[package]
+name = "shirabe-spdx-licenses"
+version.workspace = true
+edition.workspace = true
+
+[dependencies]
+shirabe-php-shim.workspace = true
+
+[lints]
+workspace = true
diff --git a/crates/shirabe-spdx-licenses/src/lib.rs b/crates/shirabe-spdx-licenses/src/lib.rs
new file mode 100644
index 0000000..e0473bf
--- /dev/null
+++ b/crates/shirabe-spdx-licenses/src/lib.rs
@@ -0,0 +1,3 @@
+mod spdx_licenses;
+
+pub use spdx_licenses::*;
diff --git a/crates/shirabe-spdx-licenses/src/spdx_licenses.rs b/crates/shirabe-spdx-licenses/src/spdx_licenses.rs
new file mode 100644
index 0000000..b955ccd
--- /dev/null
+++ b/crates/shirabe-spdx-licenses/src/spdx_licenses.rs
@@ -0,0 +1,30 @@
+//! ref: composer/vendor/composer/spdx-licenses/src/SpdxLicenses.php
+
+use shirabe_php_shim::PhpMixed;
+
+#[derive(Debug)]
+pub struct SpdxLicenses;
+
+impl Default for SpdxLicenses {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl SpdxLicenses {
+    pub fn new() -> Self {
+        todo!()
+    }
+
+    pub fn validate(&self, _license: &str) -> bool {
+        todo!()
+    }
+
+    pub fn get_license_by_identifier(&self, _identifier: &str) -> Option<PhpMixed> {
+        todo!()
+    }
+
+    pub fn get_licenses(&self) -> PhpMixed {
+        todo!()
+    }
+}