Scaffold workspace, shared types and requirements spec

Cargo workspace with core/ble/fit/probe crates. crates/core/src/types.rs
is the fixed contract between the BLE layer, ride engine and UI.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src-tauri/tauri.conf.json

@@ -0,0 +1,48 @@
+{
+  "$schema": "https://schema.tauri.app/config/2",
+  "productName": "BikeControl",
+  "version": "0.1.0",
+  "identifier": "paris.tourolle.bikecontrol",
+  "build": {
+    "frontendDist": "../ui/dist",
+    "devUrl": "http://localhost:1420",
+    "beforeDevCommand": {
+      "cwd": "../ui",
+      "script": "npm run dev"
+    },
+    "beforeBuildCommand": {
+      "cwd": "../ui",
+      "script": "npm run build"
+    }
+  },
+  "app": {
+    "windows": [
+      {
+        "title": "BikeControl",
+        "width": 1440,
+        "height": 900,
+        "minWidth": 960,
+        "minHeight": 640,
+        "resizable": true,
+        "fullscreen": false,
+        "backgroundColor": "#07090d"
+      }
+    ],
+    "security": {
+      "csp": "default-src 'self'; style-src 'self' 'unsafe-inline'; img-src 'self' data:; connect-src ipc: http://ipc.localhost"
+    }
+  },
+  "bundle": {
+    "active": true,
+    "targets": "all",
+    "icon": [
+      "icons/32x32.png",
+      "icons/128x128.png",
+      "icons/128x128@2x.png",
+      "icons/icon.png"
+    ],
+    "category": "Utility",
+    "shortDescription": "Indoor cycling trainer control",
+    "longDescription": "Control a smart trainer over BLE, ride gradient profiles and synthetic waveforms, and record the result."
+  }
+}