chore: bump version to 0.7.0

[TimInTech]

Summary

• Bumps app/__init__.py version from 0.6.0 → 0.7.0
• Bundles Paket J (Prompt-Transparenz & Prompt-Editor, PR feat: Paket J — Prompt-Transparenz & Prompt-Editor #29)

Changelog

Paket J — Prompt-Transparenz & Prompt-Editor

• Show Prompt button in Compose Window (enabled when text is entered)
• Prompt preview/editor dialog showing system prompt + user message before LLM submission
• Full i18n support (DE/EN)

Fixes

• Secret hygiene scan: removed literal OPENAI_API_KEY= from README examples (PR feat: Paket J — Prompt-Transparenz & Prompt-Editor #29 fix)

Test plan

• CI: Secret hygiene scan ✅
• CI: Tests Python 3.11 ✅
• CI: Tests Python 3.12 ✅
• GitGuardian ✅

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