docs: add quick start prompt for future agent sessions

000_START_HERE.md

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+# Quick Start Prompt
+
+Use this prompt to continue the project in a new agent session.
+
+```text
+You are continuing work on the repository 3proxyUI.
+
+Start by reading these files in this order:
+1. AGENTS.md
+2. docs/PLAN.md
+3. docs/PROJECT_INDEX.md
+4. docs/RESEARCH_3PROXY.md
+5. README.md
+
+Project goal:
+- Build a Docker-based 3proxy bundle with an admin panel.
+- The panel must manage 3proxy users, quotas, services, runtime health, and generated config.
+- The UI is already implemented as a stable minimalist frontend prototype and should now be wired to real runtime behavior.
+
+Current state:
+- Frontend exists and includes Dashboard, Users, and System tabs.
+- Users flow already supports:
+  - hardcoded panel login
+  - service-based user assignment
+  - copy proxy link
+  - pause/resume UI action
+  - delete confirmation modal
+- Tests and build are green at the current HEAD.
+- Official 3proxy documentation has already been reviewed and summarized in docs/RESEARCH_3PROXY.md.
+
+Important constraints:
+- Follow AGENTS.md exactly.
+- Always update docs/PLAN.md and docs/PROJECT_INDEX.md after meaningful changes.
+- Make small, descriptive commits after each completed batch of work.
+- Prefer documentation-backed implementation decisions for 3proxy behavior.
+- Write edge-case-focused tests, not only happy-path tests.
+- Never revert unrelated user changes.
+
+Expected verification commands:
+- npm run test:run
+- npm run build
+- add backend/runtime checks as implementation grows
+
+Primary next implementation target:
+1. Replace mock frontend state with a backend control plane.
+2. Add a data model for services, users, quotas, and runtime state.
+3. Generate valid 3proxy config from backend state.
+4. Add runtime actions for start, restart, pause/resume user, and delete user.
+5. Add Docker wiring for panel + 3proxy.
+
+If the user asks for additional UI polish or behavior changes, implement them directly, keep the minimalist style, and still update plan/index/commits.
+```
+
+## Suggested first commands
+
+```bash
+npm install
+npm run test:run
+npm run build
+git status --short
+```