docs: add missing project configuration documentation page content

[TrueFurina]

Summary

Per #20: docs/PROJECT_CONFIGURATION.md was a copy of the CNA template (ESLint/Prettier/TypeScript/Husky) with no Python-specific content. Fills in the CPA-relevant parts (uv, pyproject, env).

Changes

• docs/PROJECT_CONFIGURATION.md: appended three sections:
  • uv — package/project manager usage (uv sync, uv add, uv run), lockfile as source of truth
  • pyproject.toml — metadata / dependencies / [tool.*] config, prefer uv add to keep lockfile in sync
  • Environment variables (.env) — .env.example template, gitignore note, how to add a new variable

Verification

• Content matches the repo's actual Python tooling (uv + pyproject.toml + uv.lock present in the repo)
• Existing CNA-derived sections untouched

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[coderabbitai]

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