chore(release): reconcile main with v0.15.0 (#8635)

Bring in what v0.15.0 shipped: the 0.15.0 entry in CHANGELOG.md and
CHANGELOG.zh-CN.md exactly as tagged (replacing the 0.15.0-beta.1 series
entry), version 0.15.0 across package.json/package-lock.json, the F-Droid
changelogs 150001-150004.txt, and the matching Nix npm deps hash.

packages/client/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@getpaseo/client",
-  "version": "0.15.0-beta.1",
+  "version": "0.15.0",
   "description": "Paseo client SDK package",
   "files": [
     "dist",
@@ -47,8 +47,8 @@
     "test": "vitest run"
   },
   "dependencies": {
-    "@getpaseo/protocol": "0.15.0-beta.1",
-    "@getpaseo/relay": "0.15.0-beta.1",
+    "@getpaseo/protocol": "0.15.0",
+    "@getpaseo/relay": "0.15.0",
     "ws": "^8.20.0",
     "zod": "^4.4.3"
   },