build: align @run402/functions devDep to ^3.0.0

Root devDep was ^2.7.0; @run402/astro@2.0.0 peer-deps ^3.0.0.
Caused publish workflow lockfile-sync to ERESOLVE on npm 11.
No runtime imports of @run402/functions in this repo — only
docstrings, scaffold-templates in init-astro, and string fixtures
in tests — so the bump is types-only.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: MajorTal

package-lock.json

@@ -69,7 +69,7 @@
     "zod": "^3.24.0"
   },
   "devDependencies": {
-    "@run402/functions": "^2.7.0",
+    "@run402/functions": "^3.0.0",
     "@types/node": "^22.0.0",
     "@x402/evm": "^2.6.0",
     "@x402/fetch": "^2.6.0",