Implement plain KNN classifier and testing infrastructure

- Add plain KNN implementation with JSONL data processing
- Create Docker deployment setup with python:3.13-slim base
- Add comprehensive OJ-style testing system with accuracy validation
- Update README with detailed scoring mechanism explanation
- Add run.sh script following competition manual requirements

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

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

Cargo.toml

@@ -4,8 +4,9 @@ version = "0.1.0"
 edition = "2024"
 
 [dependencies]
-tfhe = { version = "~1.2.0", features = ["integer"] }
-csv = "1.3"
-serde = { version = "1.0", features = ["derive"] }
-anyhow = "1.0"
+tfhe = { version = "1", features = ["integer"] }
+serde = { version = "1", features = ["derive"] }
+anyhow = "1"
 rand = "0.9"
+clap = { version = "4.0", features = ["derive"] }
+serde_json = "1"