fix(deps): add missing runtime deps @toon-format/toon and safe-regex (#5771)

Both packages are imported at runtime but were only declared for their
type shims (safe-regex was via @types/safe-regex; @toon-format/toon
had no declaration at all). Missing runtime deps mean:

- open-sse/services/compression/engines/headroom/toon.ts imports
  @toon-format/toon → MODULE_NOT_FOUND on cold pnpm/npm install
- open-sse/services/compression/engines/ccr/ccrQuery.ts imports
  safe-regex → MODULE_NOT_FOUND

Both engines are wired into the stacked compression pipeline (default
enabled), so a fresh clone that does not have a stale node_modules
from a previous version crashes as soon as the pipeline runs.

Verified with pnpm ls / grep before/after.

package.json

@@ -217,6 +217,7 @@
     "@monaco-editor/react": "^4.7.0",
     "@ngrok/ngrok": "^1.7.0",
     "@swc/helpers": "0.5.23",
+    "@toon-format/toon": "^2.3.0",
     "@types/mdx": "^2.0.13",
     "@xyflow/react": "^12.11.1",
     "axios": "^1.16.1",
@@ -265,6 +266,7 @@
     "react-markdown": "^10.1.0",
     "react-reconciler": "^0.33.0",
     "recharts": "^3.8.1",
+    "safe-regex": "^2.1.1",
     "selfsigned": "^5.5.0",
     "socks": "^2.8.7",
     "sql.js": "^1.14.1",