feat(e2e): enable SuperSync tests in e2e:docker:all script

Modify e2e:docker:all to run all 360+ E2E tests including @supersync tests.

- Start all required services (app, webdav, db, supersync)
- Add wait-for-supersync.sh for SuperSync health check
- Execute tests in two phases:
  - Phase 1: Non-supersync tests (default workers)
  - Phase 2: SuperSync tests (3 workers to avoid server overload)
- Both phases run independently; exit code reflects first failure
- Previously skipped 131 @supersync tests now included

Resolves complete E2E test coverage for all sync providers.

scripts/wait-for-supersync.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+# Wait for SuperSync server to be ready at http://localhost:1901
+# Retries for up to 90 seconds (accounts for PostgreSQL + SuperSync startup)
+
+echo "Waiting for SuperSync server on http://localhost:1901..."
+
+MAX_WAIT=90
+elapsed=0
+until curl -s http://localhost:1901/health > /dev/null 2>&1; do
+  if [ $elapsed -ge $MAX_WAIT ]; then
+    echo "Timeout: SuperSync server did not start within ${MAX_WAIT}s"
+    echo "--- SuperSync logs ---"
+    docker compose -f docker-compose.yaml -f docker-compose.supersync.yaml logs supersync
+    exit 1
+  fi
+  sleep 1
+  elapsed=$((elapsed + 1))
+done
+
+echo "SuperSync server is ready!"