Add fpv-rate-profile-playground app

apps/fpv-rate-profile-playground/config.json

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+{
+  "name": "FPV Rate Profile Playground",
+  "id": "fpv-rate-profile-playground",
+  "available": true,
+  "short_desc": "Visualize, compare, and share Betaflight Actual Rates profiles with a shareable URL API",
+  "author": "cori",
+  "port": 8386,
+  "categories": ["utilities"],
+  "description": "FPV Rate Profile Playground is a web-based tool for interactively configuring and comparing Betaflight Actual Rates profiles. Adjust roll, pitch, yaw, and throttle parameters with live graph updates, then generate a shareable URL to compare multiple profiles side-by-side. Includes a REST API so LLMs and scripts can POST profile data and receive a visualization URL in return. Import settings from Betaflight CLI dumps and export CLI commands to paste back into your FC.",
+  "tipi_version": 1,
+  "min_tipi_version": "4.5.0",
+  "version": "sha-afc4f58",
+  "source": "https://github.com/cori/fpv-rate-profile-playground",
+  "website": "https://github.com/cori/fpv-rate-profile-playground",
+  "exposable": true,
+  "supported_architectures": ["arm64", "amd64"],
+  "created_at": 1744934400000,
+  "updated_at": 1744934400000,
+  "dynamic_config": true,
+  "form_fields": []
+}

apps/fpv-rate-profile-playground/docker-compose.json

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+{
+  "schemaVersion": 2,
+  "services": [
+    {
+      "name": "fpv-rate-profile-playground",
+      "image": "ghcr.io/cori/fpv-rate-profile-playground:sha-afc4f58",
+      "isMain": true,
+      "internalPort": "3000",
+      "environment": [
+        { "key": "NODE_ENV", "value": "production" },
+        { "key": "PORT", "value": "3000" }
+      ]
+    }
+  ]
+}

apps/fpv-rate-profile-playground/metadata/description.md

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+# FPV Rate Profile Playground
+
+A web-based tool for visualizing, comparing, and sharing Betaflight Actual Rates profiles in real time.
+
+## Features
+
+- **Interactive rate curves** — Roll, pitch, and yaw overlaid on a single graph with live updates as you adjust sliders
+- **Throttle curve** — Adjustable mid-point and expo with visual feedback
+- **Multi-profile comparison** — Load up to 5 profiles simultaneously; first profile is editable, additional profiles appear as dashed reference overlays
+- **Shareable URLs** — Every profile state is encodable as a URL you can bookmark or share
+- **CLI import / export** — Paste a Betaflight dump to populate all sliders; copy CLI commands to apply settings on your FC
+- **LLM-friendly REST API** — POST rate profiles to `/api/share`, receive a visualization URL back
+
+## API
+
+The app exposes a small REST API for programmatic use:
+
+| Endpoint | Description |
+|---|---|
+| `POST /api/share` | Submit 1–5 profiles, receive a shareable comparison URL |
+| `GET /openapi.json` | OpenAPI 3.0 spec for the API |
+| `GET /.well-known/ai-plugin.json` | AI plugin manifest for LLM discoverability |
+
+### Example: compare two profiles
+
+```bash
+curl -s -X POST http://your-server:8386/api/share \
+  -H 'Content-Type: application/json' \
+  -d '{
+    "profiles": [
+      {"name":"Freestyle","roll_rc_rate":70,"roll_rate":670,"roll_expo":0,
+       "pitch_rc_rate":70,"pitch_rate":670,"pitch_expo":0,
+       "yaw_rc_rate":70,"yaw_rate":600,"yaw_expo":0,"thr_mid":50,"thr_expo":0},
+      {"name":"Cinematic","roll_rc_rate":40,"roll_rate":400,"roll_expo":40,
+       "pitch_rc_rate":40,"pitch_rate":400,"pitch_expo":40,
+       "yaw_rc_rate":40,"yaw_rate":350,"yaw_expo":40,"thr_mid":55,"thr_expo":30}
+    ]
+  }' | jq -r .url
+```
+
+Open the returned URL in a browser to see both profiles compared side-by-side.
+
+## Rate Parameters
+
+| Field | Range | Description |
+|---|---|---|
+| `roll_rc_rate` / `pitch_rc_rate` / `yaw_rc_rate` | 0–255 | Center sensitivity |
+| `roll_rate` / `pitch_rate` / `yaw_rate` | 200–2000 | Max rate in deg/s |
+| `roll_expo` / `pitch_expo` / `yaw_expo` | 0–100 | Expo (0 = linear) |
+| `thr_mid` | 0–100 | Throttle mid-point |
+| `thr_expo` | 0–100 | Throttle expo |
+
+## Resources
+
+- [Source Code](https://github.com/cori/fpv-rate-profile-playground)
+- [API Spec](/openapi.json)