feat: complete issue #6 - implement feature toggle integration in routes

- Add conditional route registration based on feature toggles
- AuthEnabled now controls authentication/user management endpoints
- ClusteringEnabled controls member and Merkle tree endpoints
- RevisionHistoryEnabled controls history endpoints
- Feature toggles for RateLimitingEnabled and TamperLoggingEnabled were already implemented

This completes issue #6 allowing flexible deployment scenarios by disabling
unnecessary features and their associated endpoints.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

issues/6.md

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+# Issue #6: Configuration Options to Disable Optional Functionalities
+
+**Status:** ✅ **COMPLETED**  
+**Author:** MrKalzu  
+**Created:** 2025-09-12  
+**Repository:** https://git.rauhala.info/ryyst/kalzu-value-store/issues/6
+
+## Description
+
+Proposes adding configuration options to disable advanced features in the KVS (Key-Value Store) server to allow more flexible and lightweight deployment scenarios.
+
+## Suggested Disablement Options
+
+1. **Authentication System** - Disable JWT authentication entirely
+2. **Tamper-Evident Logging** - Disable cryptographic audit trails
+3. **Clustering** - Disable gossip protocol and distributed features
+4. **Rate Limiting** - Disable per-client rate limiting
+5. **Revision History** - Disable automatic versioning
+
+## Proposed Implementation
+
+- Add boolean flags to the Config struct for each feature
+- Modify server initialization and request handling to respect these flags
+- Allow conditional compilation/execution of features based on configuration
+
+## Pros of Proposed Changes
+
+- Reduce unnecessary overhead for simple deployments
+- Simplify setup for different deployment needs
+- Improve performance for specific use cases
+- Lower resource consumption
+
+## Cons of Proposed Changes
+
+- Potential security risks if features are disabled inappropriately
+- Loss of advanced functionality like audit trails or data recovery
+- Increased complexity in codebase with conditional feature logic
+
+## Already Implemented Features
+
+- Backup System (configurable)
+- Compression (configurable)
+
+## Implementation Notes
+
+The issue suggests modifying relevant code sections to conditionally enable/disable these features based on configuration, similar to how backup and compression are currently handled.