Sync broccolini-bot: rename from zammad, docs in docs/, security gitignore, remove zammad deps

Co-authored-by: Cursor <cursoragent@cursor.com>

docs/MONGODB_SETUP.md

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+# MongoDB Setup for Broccolini Bot
+
+## Overview
+
+Broccolini Bot uses **MongoDB only** for persistent storage (tickets, transcripts, counters, tags, close requests). Run all commands from the repo root; create `.env` there (copy from `.env.example`) and set `MONGODB_URI`. For test runs, use `.env.test` (copy from `.env.test.example`) and `npm run test-mongodb:test`; see [ENV_AND_SECURITY.md](./ENV_AND_SECURITY.md).
+
+## Files
+
+1. **`db-connection.js`** - MongoDB connection module with reconnection logic
+2. **`models.js`** - Mongoose schemas including:
+   - `Ticket` - Stores ticket information
+   - `TicketCounter` - Tracks ticket numbers per sender
+   - `Transcript` - Stores transcript message references
+3. **`scripts/test-mongodb.js`** - Connection test script (run via `npm run test-mongodb`; use `npm run test-mongodb:test` with `.env.test`)
+
+## Configuration
+
+### 1. Environment Variable
+
+Add to your `.env` file:
+
+```env
+MONGODB_URI=mongodb://localhost:27018/broccolini_bot
+```
+
+**Note:** Uses port `27018` to match your existing setup (as defined in docker-compose.yml).
+
+### 2. Install Dependencies
+
+```bash
+npm install
+```
+
+This will install `mongoose@^6.12.0`.
+
+## Usage in Your Code
+
+### Basic Connection
+
+```javascript
+const { connectMongoDB, closeMongoDB, mongoose } = require('./db-connection');
+
+// In your Discord client.once('ready', ...) event:
+await connectMongoDB(process.env.MONGODB_URI);
+console.log('Connected to MongoDB');
+
+// Get models:
+const Ticket = mongoose.model('Ticket');
+const TicketCounter = mongoose.model('TicketCounter');
+const Transcript = mongoose.model('Transcript');
+```
+
+## Schema Reference
+
+### Ticket Schema
+
+```javascript
+{
+    gmail_thread_id: String (required, unique, indexed),
+    discord_thread_id: String,
+    broccolini_ticket_id: Number,
+    sender_email: String (required),
+    subject: String,
+    created_at: Date (default: now),
+    status: String (enum: ['open', 'closed'], default: 'open'),
+    claimed_by: String (Discord user ID),
+    escalated: Boolean (default: false),
+    ticket_number: Number,
+    rename_count: Number (default: 0),
+    rename_window_start: Date
+}
+```
+
+### TicketCounter Schema
+
+```javascript
+{
+    sender_local: String (required, unique),
+    counter: Number (default: 1)
+}
+```
+
+### Transcript Schema
+
+```javascript
+{
+    gmail_thread_id: String (required),
+    transcript_message_id: String,
+    created_at: Date (default: now)
+}
+```
+
+## Testing the Connection
+
+From the repo root, run:
+
+```bash
+npm run test-mongodb
+```
+
+Expected output:
+```
+Pinged your deployment. You successfully connected to MongoDB!
+```
+
+## Graceful Shutdown
+
+Add this to your main file for clean shutdown:
+
+```javascript
+process.on('SIGTERM', async () => {
+    console.log('SIGTERM received, closing connections...');
+    await closeMongoDB();
+    await client.destroy(); // Discord client
+    process.exit(0);
+});
+
+process.on('SIGINT', async () => {
+    console.log('SIGINT received, closing connections...');
+    await closeMongoDB();
+    await client.destroy();
+    process.exit(0);
+});
+```
+
+## Connection Features
+
+- **Auto-reconnection**: If MongoDB connection drops, Mongoose will automatically attempt to reconnect
+- **Connection events**: Logs when connected, disconnected, and reconnected
+- **Error handling**: Graceful error messages with stack traces
+- **Timeouts**: Configured with reasonable defaults (5s server selection, 45s socket timeout)
+
+## Next Steps
+
+1. Review the schemas in `models.js`
+2. Test the connection with `npm run test-mongodb`
+3. Start the bot with `npm start` (uses MongoDB throughout)
+4. Monitor MongoDB connection in production logs
+
+## Troubleshooting
+
+### Connection refused
+- Check MongoDB is running: `docker ps` or `systemctl status mongodb`
+- Verify port 27018 is correct in `.env`
+- Check MongoDB logs for errors
+
+### Authentication failed
+- If MongoDB requires auth, update URI: `mongodb://username:password@localhost:27018/broccolini_bot`
+
+### Schema validation errors
+- Check required fields are provided when creating documents
+- Ensure `status` is either 'open' or 'closed' (enum validation)