feat(dict): make the build's dictionary version deploy-authoritative

The dictionary lives on a persistent volume seeded from the image once and never
re-seeded, so a redeploy that bumped BACKEND_DICT_VERSION left the new DAWGs
unreachable (the volume mount shadows the image copy) and the active version stuck
at whatever the admin console last installed — a native offline-first client then
fetched the server's older pinned version over the network instead of using its
bundled dict.

On boot the backend now DELIVERS the build version onto the volume add-only, from a
second unshadowed image copy at BACKEND_DICT_SEED_DIR, into DICT_DIR/<version>/ when
absent (the flat seed and prior uploads untouched, so in-flight games keep theirs),
and InitActiveVersion makes the build version active — except a console-installed
version NEWER than the build (compared numerically) is not downgraded by a restart.
The .seed_version guard still protects the flat seed's label (a bump is a new
subdirectory, never a relabel). The console stays for out-of-band updates.

Docs: ARCHITECTURE.md §5, deploy/README.md, seedmarker.go. Tests: engine.DeliverVersion
(add-only, idempotent, flat-seed skip), compareDictVersions, and the dictionary-update
integration test's deploy-delivers path.

backend/internal/game/version_test.go

@@ -0,0 +1,37 @@
+package game
+
+import "testing"
+
+func TestCompareDictVersions(t *testing.T) {
+	cases := []struct {
+		a, b string
+		want int
+	}{
+		{"v1.3.0", "v1.3.1", -1},
+		{"v1.3.1", "v1.3.0", 1},
+		{"v1.3.1", "v1.3.1", 0},
+		{"v1.3.9", "v1.3.10", -1}, // numeric, not lexical
+		{"v1.10.0", "v1.9.0", 1},
+		{"v2.0.0", "v1.9.9", 1},
+		{"1.3.1", "v1.3.1", 0}, // the leading v is optional
+		// Non-semver falls back to a byte comparison, keeping the ordering total.
+		{"weird", "weird", 0},
+		{"a", "b", -1},
+	}
+	for _, c := range cases {
+		if got := compareDictVersions(c.a, c.b); sign(got) != c.want {
+			t.Errorf("compareDictVersions(%q, %q) = %d, want sign %d", c.a, c.b, got, c.want)
+		}
+	}
+}
+
+func sign(n int) int {
+	switch {
+	case n < 0:
+		return -1
+	case n > 0:
+		return 1
+	default:
+		return 0
+	}
+}