docs(deployments): single-site pattern

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+# Single-site deployment
+
+The default deployment pattern. Most customers start here.
+
+## Topology
+
+`R+1`: 1 router + 1 Cell + N cameras + optional operator workstation.
+
+```
+                Internet (WAN)
+                     │
+                     ▼
+                ┌──────────┐
+                │  Blocao  │
+                │  Router  │
+                └────┬─────┘
+            ┌────────┴────────────┐
+            │                     │
+       VLAN-10                VLAN-20
+       Cameras (N)            Cell
+       192.168.10/24          192.168.20.10
+       │
+       ├── cam-01 (PoE)
+       ├── cam-02 (PoE)
+       ├── cam-03 (WiFi 5GHz)
+       └── cam-04 (...)
+```
+
+## Hardware shopping list (4-cam example)
+
+| Item | Model | Notes |
+|---|---|---|
+| Router | GL.iNet GL-MT6000 | 4×2.5GbE LAN + 1×2.5GbE WAN, WiFi 6E |
+| Cell | Banana Pi BPI-W3 + 1TB NVMe + 4TB HDD | RK3588 with 6 TOPS NPU |
+| Cameras | 4× Reolink RLC-820A or equivalent | 4K, ONVIF, PoE |
+| PoE switch | Mikrotik CSS610-8P-2S+IN | 8 PoE+ ports + 2 SFP+ |
+| UPS | Any 600W+ | Cell + router for 30min |
+
+Approximate hardware cost: €1,500-2,500 depending on cameras chosen.
+
+## Install procedure
+
+1. **Prep at office**:
+   - Flash router with Blocao firmware (image from CI artifacts).
+   - Verify Balena fleet has the Cell stack ready.
+   - Pre-configure site ID and network parameters in the wizard if known.
+
+2. **On site**:
+   - Mount cameras, run cabling.
+   - Connect: cameras → PoE switch → router LAN port (trunked VLAN), Cell → router LAN port, WAN cable to upstream router/modem.
+   - Power on router first, then Cell, then cameras.
+
+3. **First boot**:
+   - From a laptop on VLAN-30 (or via Tailscale if pre-provisioned), open `http://blocao-router.local/`.
+   - Wizard runs. Installer goes through 6 steps (~15 minutes).
+   - Provisioning completes; redirects to SYNOPSIS.
+
+4. **Camera onboarding**:
+   - From CAMS panel, click ADD CAMERA.
+   - Auto-discovery finds cameras in VLAN-10.
+   - For each: authenticate, force password rotation, test stream, name, save.
+   - Verify event flow in SYNOPSIS.
+
+5. **Verification**:
+   - HEALTH panel shows all green.
+   - MQTT panel shows events flowing.
+   - Walk in front of a camera, confirm event in MQTT live tail.
+
+6. **Handover**:
+   - Customer-side admin gets operator credentials.
+   - Walk through FORENSICS panel with sample data.
+   - Document case management workflow if applicable.
+
+Estimated time on site: half a day for an experienced installer with prepped hardware.
+
+## What customer sees
+
+Day 1 after install: cameras recording, events being detected, console accessible from mgmt VLAN or via Tailscale.
+
+Day 30: 30 days of footage retained, queries work across that range, evidence packs exportable for any case.
+
+Day 90: typical first review meeting. Customer feedback informs config tweaks (zone definitions, retention overrides, model thresholds).
+
+## Common gotchas
+
+- **Camera vendor portal phone-home blocked**: cameras may show "cloud disconnected" in their own UI. This is intentional. Show the customer the DNS sinkhole stat for reassurance.
+- **WiFi cameras drop**: 2.4GHz is congested, 5GHz has range issues. Use cabled cameras when possible; HaLow as the future option for distance.
+- **WAN flaky**: hub bridge will queue events and reconnect. Customer doesn't need to do anything.
+- **Wrong NTP**: chrony with NTS is the default. If a customer has a strict internal NTP server, configure it in the wizard step.
+- **Operator forgets password**: recovery via console port on the router (physical access) or hub-side Keycloak admin reset.
+
+## Limits of single-site
+
+- One Cell ≈ 8-12 cameras at 1080p H.265 with full Frigate. Beyond that, scale to `R+2` (two Cells).
+- Local storage limit: see [`../01-architecture/storage-retention.md`](../01-architecture/storage-retention.md).
+- No cross-site queries (need hub).
+- No central operator audit (need hub).
+
+For single-site only, the customer doesn't need a hub subscription. Standalone mode (configured in wizard step 5) skips hub registration entirely.