feat: set up Schubert An die Musik D547 workspace for VSlavik1

Two projects covering the high and low key IMSLP scan variants:
- Schubert-AnDieMusik-D547-hoch (Peters, high key)
- Schubert-AnDieMusik-D547-tief (Lieder Bd2, low key)

Each project contains:
- 1_parsing/input/: through-composed MusicXML (46 measures, 2 lyric lines)
- 2_ocr/input/: 2 PNG scan pages converted from IMSLP PDF at 200 DPI
- 3a_svg/input/: empty, ready for OCR-aligned JSON

access_control.json: VSlavik1 granted write access to both projects

.gitattributes

@@ -0,0 +1 @@
+*.png filter=lfs diff=lfs merge=lfs -text

musicocr-data/manifests/access_control.json

@@ -0,0 +1,21 @@
+{
+  "schema_version": "1.0",
+  "users": {
+    "local-admin": {
+      "role": "admin",
+      "github_logins": ["komisla"],
+      "all_projects": true,
+      "all_projects_access": "write",
+      "can_create_projects": true
+    },
+    "VSlavik1": {
+      "role": "editor",
+      "github_login": "VSlavik1",
+      "projects": [
+        "Schubert-AnDieMusik-D547-hoch",
+        "Schubert-AnDieMusik-D547-tief"
+      ],
+      "projects_access": "write"
+    }
+  }
+}