Release v0.2.0 - Security and integrity features

- Add REST API response signing using HMAC-SHA256
- Add SHA256 hash validation for version file uploads
- Add ResponseSigner class for automatic API response signing
- Add file_hash column to database schema
- Remove external URL support from version uploads
- Update translations with all fuzzy strings resolved

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

languages/wc-licensed-product.pot

@@ -6,7 +6,7 @@
 #, fuzzy
 msgid ""
 msgstr ""
-"Project-Id-Version: WooCommerce Licensed Product 0.1.0\n"
+"Project-Id-Version: WooCommerce Licensed Product 0.2.0\n"
 "Report-Msgid-Bugs-To: \n"
 "POT-Creation-Date: 2026-01-22 11:52+0100\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
@@ -1408,3 +1408,25 @@ msgstr ""
 #: src/Product/LicensedProductType.php:162
 msgid "No"
 msgstr ""
+
+#: src/Admin/VersionAdminController.php:101
+msgid "SHA256 Hash"
+msgstr ""
+
+#: src/Admin/VersionAdminController.php:103
+msgid "Enter SHA256 checksum..."
+msgstr ""
+
+#: src/Admin/VersionAdminController.php:104
+msgid "SHA256 checksum of the uploaded file (optional but recommended for integrity verification)."
+msgstr ""
+
+#: src/Product/VersionManager.php:67
+msgid "Attachment file not found."
+msgstr ""
+
+#. translators: 1: provided hash, 2: calculated hash
+#: src/Product/VersionManager.php:73
+#, php-format
+msgid "File checksum does not match. Expected: %1$s, Got: %2$s"
+msgstr ""