Unify auth and MCP servers into single modular codebase

- Merge auth-server and mcp-server into unified architecture under src/modules/
- Add configurable auth modes: internal (single process) and external (separate processes)
- Update example scripts to support OAuth discovery and both auth modes
- Consolidate OAuth documentation into comprehensive implementation guide
- Add configuration options for development vs production deployments
- Support both Redis-backed and in-memory session storage

scripts/test-e2e-all.sh

@@ -0,0 +1,71 @@
+#!/bin/bash
+set -e
+
+echo "=============================================="
+echo "End-to-End Test Suite - All Modes"
+echo "=============================================="
+echo ""
+
+# Parse command line arguments
+MODE="${1:-all}"
+
+case "$MODE" in
+    internal)
+        echo "🔧 Running INTERNAL mode tests only..."
+        bash scripts/test-e2e-internal.sh
+        ;;
+    external)
+        echo "🔧 Running EXTERNAL mode tests only..."
+        bash scripts/test-e2e-external.sh
+        ;;
+    all|"")
+        echo "🔧 Running tests for ALL modes..."
+        echo ""
+
+        # Run internal mode tests
+        echo "▶️  Testing INTERNAL mode..."
+        echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
+        if bash scripts/test-e2e-internal.sh; then
+            INTERNAL_RESULT="✅ PASSED"
+        else
+            INTERNAL_RESULT="❌ FAILED"
+        fi
+
+        echo ""
+        echo ""
+
+        # Run external mode tests
+        echo "▶️  Testing EXTERNAL mode..."
+        echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
+        if bash scripts/test-e2e-external.sh; then
+            EXTERNAL_RESULT="✅ PASSED"
+        else
+            EXTERNAL_RESULT="❌ FAILED"
+        fi
+
+        # Summary
+        echo ""
+        echo "=============================================="
+        echo "E2E TEST SUITE SUMMARY"
+        echo "=============================================="
+        echo "Internal Mode: $INTERNAL_RESULT"
+        echo "External Mode: $EXTERNAL_RESULT"
+        echo ""
+
+        # Exit with error if any test failed
+        if [[ "$INTERNAL_RESULT" == *"FAILED"* ]] || [[ "$EXTERNAL_RESULT" == *"FAILED"* ]]; then
+            echo "❌ Some tests failed"
+            exit 1
+        else
+            echo "✅ All tests passed!"
+        fi
+        ;;
+    *)
+        echo "❌ Invalid mode: $MODE"
+        echo "Usage: $0 [internal|external|all]"
+        echo "  internal - Test internal mode only"
+        echo "  external - Test external mode only"
+        echo "  all      - Test both modes (default)"
+        exit 1
+        ;;
+esac