fix: remove duplicate dependencies in package.json

Removed duplicate entries that were causing yarn.lock inconsistencies:

dependencies:
- libsignal (kept github:whiskeysockets/libsignal-node)
- lru-cache (kept ^11.2.6, removed ^11.1.0)
- music-metadata (kept ^11.12.0, removed ^11.7.0)

devDependencies:
- link-preview-js (kept ^4.0.0, removed ^3.0.0)
- lru-cache (kept ^11.2.6, removed ^11.1.0)
- open (kept ^11.0.0, removed ^8.4.2)

JSON spec keeps the last occurrence of duplicate keys, which was
causing Yarn to try reverting to older versions during CI installs.

https://claude.ai/code/session_015R3U3kiprQiNTTNNt31Sg6

package.json

@@ -48,9 +48,6 @@
     "libsignal": "github:whiskeysockets/libsignal-node",
     "lru-cache": "^11.2.6",
     "music-metadata": "^11.12.0",
-    "libsignal": "https://github.com/whiskeysockets/libsignal-node.git",
-    "lru-cache": "^11.1.0",
-    "music-metadata": "^11.7.0",
     "p-queue": "^9.0.0",
     "pino": "^10.3.1",
     "prom-client": "^15.1.3",
@@ -77,11 +74,8 @@
     "jimp": "^1.6.0",
     "jiti": "^2.4.2",
     "json": "^11.0.0",
-    "link-preview-js": "^3.0.0",
-    "lru-cache": "^11.2.6",
-    "open": "^8.4.2",
     "link-preview-js": "^4.0.0",
-    "lru-cache": "^11.1.0",
+    "lru-cache": "^11.2.6",
     "open": "^11.0.0",
     "pino-pretty": "^13.1.1",
     "prettier": "^3.8.1",