Introduce PromptAi support: add model, migration, seeder and controller with full CRUD endpoints, and register routes under /api/prompt-ai. Integrate DB-driven prompts into LineConnection (replace hardcoded prompt strings for DPELP and ENV with fetched PromptAi records). Update frontend ModalConfig to add a Prompt AI management tab (fetch, create, edit prompts), plus related UI tweaks (tabs, prompt editor modal, axios/notifications). This makes AI prompts editable at runtime without code changes.
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