Stamp 2.57.0 native package.json, requirements, and unused Docker copies.

Frontend periscope-web manifests, pip requirements, and EDA logos/examples
overlay from src. Docker installs from those files. Unused PinScope public
blobs are dockerignored. Landing png/gif stay in dependency until native
captures exist.

.github/workflows/ci.yml

@@ -14,7 +14,7 @@ jobs:
         with:
           python-version: "3.12"
           cache: pip
-      - run: pip install -r periscope/dependency/backend/requirements.txt pytest pytest-asyncio
+      - run: pip install -r periscope/src/backend/requirements.txt pytest pytest-asyncio
       - run: pytest tests/ -q
 
   frontend:
@@ -25,7 +25,7 @@ jobs:
         with:
           node-version: 22
           cache: npm
-          cache-dependency-path: periscope/dependency/frontend/package-lock.json
+          cache-dependency-path: periscope/src/frontend/package-lock.json
       - run: chmod +x scripts/materialize-frontend.sh && scripts/materialize-frontend.sh
       - run: npm ci
         working-directory: .merge/frontend