Add score template schema registry and documentation

[ekhanatime]

Summary

• add score template JSON schema, validation helpers, registry utilities, and FastAPI endpoints backed by a bundled performance template
• refresh documentation structure with a new SPOT hub, function pages, ERD assets, and tasklist while wiring router/core setup governance comments
• allow disabling Redis and database initialization during tests via environment flags to keep automated suites self-contained

Testing

• PYTHONPATH=src DISABLE_REDIS_FOR_TESTS=1 DISABLE_DB_FOR_TESTS=1 uv run --extra dev pytest

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https://chatgpt.com/codex/tasks/task_b_68d3db2c2d4c8328ad6348c0afbaa89c