Fix: Revert to inline shared types (Turbopack can't resolve path aliases)

Turbopack doesn't support tsconfig path aliases pointing outside
the project root. Reverted to copying shared types directly into
each service. The canonical source remains shared/types/*.ts,
synced via scripts/sync-shared-types.sh.

Changes:
- Reverted docker-compose.yml contexts to ./service
- Reverted Dockerfiles to simple COPY . .
- Removed @shared/* from tsconfigs
- Removed symlinks + .gitignore hacks
- Added scripts/sync-shared-types.sh for keeping copies in sync

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

scripts/sync-shared-types.sh

@@ -0,0 +1,34 @@
+#!/usr/bin/env bash
+#
+# Sync shared types from shared/types/ into each frontend service.
+#
+# The canonical source of truth is shared/types/*.ts.
+# This script copies them into each service's local directory
+# because Turbopack doesn't support tsconfig path aliases
+# pointing outside the project root.
+#
+# Run this after modifying any file in shared/types/.
+
+set -euo pipefail
+
+ROOT="$(git rev-parse --show-toplevel 2>/dev/null || pwd)"
+SHARED="$ROOT/shared/types"
+
+echo "Syncing shared types from $SHARED..."
+
+# Companion types
+cp "$SHARED/companion.ts" "$ROOT/admin-lehrer/lib/companion/types.ts"
+cp "$SHARED/companion.ts" "$ROOT/studio-v2/lib/companion/types.ts"
+
+# Klausur-Korrektur types
+cp "$SHARED/klausur.ts" "$ROOT/admin-lehrer/app/(admin)/education/klausur-korrektur/types.ts"
+cp "$SHARED/klausur.ts" "$ROOT/studio-v2/app/korrektur/types.ts"
+cp "$SHARED/klausur.ts" "$ROOT/website/app/admin/klausur-korrektur/types.ts"
+cp "$SHARED/klausur.ts" "$ROOT/website/app/lehrer/klausur-korrektur/types.ts"
+cp "$SHARED/klausur.ts" "$ROOT/website/components/klausur-korrektur/klausur-types.ts"
+
+# OCR Labeling types
+cp "$SHARED/ocr-labeling.ts" "$ROOT/admin-lehrer/app/(admin)/ai/ocr-labeling/types.ts"
+cp "$SHARED/ocr-labeling.ts" "$ROOT/website/app/admin/ocr-labeling/types.ts"
+
+echo "Done. Synced to 9 locations."