feat(templates): add systemprompt

[Ejb503]

What is this PR about?

New PR of systemprompt — a self-owned AI control plane: a governance gateway for Claude, OpenAI, and Gemini with policy checks, audit trails, rate limits, and MCP orchestration.

• Blueprint: blueprints/systemprompt/ (docker-compose.yml, template.toml, meta.json, logo.svg, instructions.md)
• Image: ghcr.io/systempromptio/systemprompt-template:0 (multi-arch amd64/arm64)
• Services: app (systemprompt, port 8080) + postgres:18-alpine, both with healthchecks and persistent volumes
• template.toml generates a 32-char Postgres password, binds a domain to systemprompt:8080, and derives EXTERNAL_URL from it
• Requires at least one AI provider API key (ANTHROPIC_API_KEY / OPENAI_API_KEY / GEMINI_API_KEY), exposed as empty env vars to fill in before first deploy
• instructions.md covers the two setup requirements: a provider key before first deploy, and HTTPS enabled on the domain (the app validates EXTERNAL_URL and rejects plain-http non-localhost origins)

Checklist

Before submitting this PR, please make sure that:

• I have read the suggestions in the README.md file https://github.com/Dokploy/templates?tab=readme-ov-file#general-requirements-when-creating-a-template
• I have tested the template in my instance, so the maintainers don't spend time trying to figure out what's wrong.
• I have added tests that demonstrate that my correction works or that my new feature works.

Issues related (if applicable)

None.

Screenshots or Videos

Testing notes (fresh Dokploy install via install.sh on a 2GB VM):

• Imported this exact blueprint via the base64 import (Compose service → Advanced → Import): compose, env, domain, and generated password all populated correctly.
• Deployed with a real provider key and HTTPS enabled on the domain: healthcheck green, https://<domain>/api/v1/health → 200, admin UI loads.
• Live inference verified through the gateway (POST /v1/messages → 200) with audit rows recorded.
• node build-scripts/generate-meta.js --check passes (494 templates), and both build-scripts/validate-docker-compose.ts and validate-template.ts pass on this blueprint.

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