Add libra v0.3.0 to catalog

Ships split-ledger routing (aiolabs/libra#28 + #29 from PR #32),
settlement net+credit semantics (#33, #41), voided-tx in user-entries
endpoint (#34), and an integration test suite. New entry added
alongside v0.2.2 per "don't overwrite versions" policy.

Live immediately for any host pointing at the manifest URL — operators
click Upgrade in lnbits admin UI to pull the new code.

extensions.json

@@ -315,6 +315,16 @@
             "archive": "https://git.atitlan.io/aiolabs/libra/archive/v0.2.2.zip",
             "hash": "06a02b18437427164c8db4857fe97bac2e7aa768ca818973cb4023b578faf607"
         },
+        {
+            "id": "libra",
+            "repo": "https://git.atitlan.io/aiolabs/libra",
+            "name": "Libra",
+            "version": "0.3.0",
+            "short_description": "Double-entry accounting for collectives",
+            "icon": "https://git.atitlan.io/aiolabs/libra/raw/branch/main/static/image/libra.png",
+            "archive": "https://git.atitlan.io/aiolabs/libra/archive/v0.3.0.zip",
+            "hash": "c04c0999576d4ce1fd33a4c5eced1f5d9f6e62065100766fde39e0fe2e96c230"
+        },
         {
             "id": "lnurlp",
             "repo": "https://github.com/lnbits/lnurlp",