Declare every module's data; the backup holder measures it (hq ADR 0233)

Backup lines are derived from each module's data section instead of written by hand; the holder
measures declared items, reads the array under them, and deletes a retired item only after a last
restore point; the Go providers say each held consumer's size so an empty replacement is seen.

modules/route-proxy/module.json

@@ -43,6 +43,22 @@
       "why": "public HTTPS for every name the mesh routes here"
     }
   ],
+  "data": {
+    "own": [
+      {
+        "id": "acme",
+        "path": "${dir:acme-cache}",
+        "class": "rebuildable",
+        "why": "issued certificates, issued again"
+      },
+      {
+        "id": "ca",
+        "path": "${dir:ca-dir}",
+        "class": "cache",
+        "why": "the authority's roots, fetched again at every start"
+      }
+    ]
+  },
   "resources": [
     {
       "id": "state",