Pin reachy-mini.js to v1.7.0 tag

Switching from the feat/ehance-js-lib branch pointer to an immutable
tag removes the recurring "jsdelivr caches a stale branch snapshot"
problem: tag URLs are immutable on the CDN's origin (GitHub) so
jsdelivr can cache them aggressively without ever going stale.

Trade-off: lib bumps now require an explicit tag-version change in
each app instead of auto-tracking the branch. Worth it for released
apps; branch pointer is better for active development.

app.js

@@ -1,4 +1,4 @@
-import { ReachyMini } from "https://cdn.jsdelivr.net/gh/pollen-robotics/reachy_mini@feat/ehance-js-lib/js/reachy-mini.js";
+import { ReachyMini } from "https://cdn.jsdelivr.net/gh/pollen-robotics/reachy_mini@v1.7.0/js/reachy-mini.js";
 import { HandLandmarker, FilesetResolver } from "https://cdn.jsdelivr.net/npm/@mediapipe/tasks-vision@0.10.14/vision_bundle.mjs";
 
 // ─── Config ───