Serve dashboard at /, version the REST API under /api/v1

The SvelteKit build was always made for the root (no base path); it
now mounts at / — registered last so /api/v1, /ws, /health, and /mcp
match first — and the JSON root endpoint is gone (its info lives in
/health and gateway_status). REST routers move from /api/* to
/api/v1/*; /ws and /health stay put; /mcp/ unchanged. Dashboard API
client, tests, README, and docs updated; dashboard rebuilt (build/ is
gitignored).

Verified live: / serves the UI, /api/v1 answers 200/401, the old
/api paths 404, MCP still lists 15 tools.

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

README.md

@@ -21,7 +21,7 @@ You give it a phone number and an intent ("dispute a charge on my December state
 │                                                                 │
 │  ┌──────────┐  ┌──────────┐  ┌───────────┐  ┌──────────────┐  │
 │  │ REST API │  │WebSocket │  │MCP Server │  │  Dashboard   │  │
-│  │ /api/*   │  │ /ws/*    │  │ (HTTP)    │  │  /dashboard  │  │
+│  │ /api/v1/*│  │ /ws/*    │  │ (HTTP)    │  │      /       │  │
 │  └────┬─────┘  └────┬─────┘  └─────┬─────┘  └──────────────┘  │
 │       │              │              │                            │
 │  ┌────┴──────────────┴──────────────┴────┐                     │
@@ -79,7 +79,7 @@ You give it a phone number and an intent ("dispute a charge on my December state
 - **REST API** — Call management, call history, transcripts, recordings, routing rules, device DND, call flow CRUD
 - **WebSocket** — Real-time call events, transcripts, classification updates, receptionist state transitions
 - **MCP Server** — 15 tools + 3 resources for AI assistant integration (make calls, send DTMF, get transcripts, manage flows), served over streamable HTTP at `/mcp/`
-- **Dashboard** — SvelteKit UI served at `/dashboard` with live monitor, call history with transcript playback, and a routing-rules editor
+- **Dashboard** — SvelteKit UI served at `/` with live monitor, call history with transcript playback, and a routing-rules editor
 
 ### Data Models
 - **Call** — Active call state with classification history, transcript chunks, hold time tracking
@@ -189,7 +189,7 @@ npm run build
 cd ..
 ```
 
-The gateway serves the built UI at `/dashboard` automatically when
+The gateway serves the built UI at `/` automatically when
 `dashboard/build/` exists. Skip this step if you only need the REST/WS API.
 
 ### 4. Run
@@ -211,7 +211,7 @@ pytest tests/ -v
 **Launch Hold Slayer on a number:**
 
 ```bash
-curl -X POST http://localhost:8000/api/calls/hold-slayer \
+curl -X POST http://localhost:8000/api/v1/calls/hold-slayer \
   -H "Authorization: Bearer $API_TOKEN" \
   -H "Content-Type: application/json" \
   -d '{
@@ -225,21 +225,21 @@ curl -X POST http://localhost:8000/api/calls/hold-slayer \
 **Check call status:**
 
 ```bash
-curl http://localhost:8000/api/calls/call_abc123
+curl http://localhost:8000/api/v1/calls/call_abc123
 ```
 
 **Browse call history (persisted in the database):**
 
 ```bash
-curl http://localhost:8000/api/calls/history?limit=50
-curl http://localhost:8000/api/calls/call_abc123/transcript
-curl -O http://localhost:8000/api/calls/call_abc123/recording   # WAV
+curl http://localhost:8000/api/v1/calls/history?limit=50
+curl http://localhost:8000/api/v1/calls/call_abc123/transcript
+curl -O http://localhost:8000/api/v1/calls/call_abc123/recording   # WAV
 ```
 
 **Create a smart-routing rule:**
 
 ```bash
-curl -X POST http://localhost:8000/api/routing/rules \
+curl -X POST http://localhost:8000/api/v1/routing/rules \
   -H "Content-Type: application/json" \
   -d '{
     "name": "Block tollfree at night",
@@ -256,7 +256,7 @@ curl -X POST http://localhost:8000/api/routing/rules \
 **Toggle Do Not Disturb on a device:**
 
 ```bash
-curl -X PATCH http://localhost:8000/api/routing/devices/dev_abc123/dnd \
+curl -X PATCH http://localhost:8000/api/v1/routing/devices/dev_abc123/dnd \
   -H "Content-Type: application/json" \
   -d '{"enabled": true}'
 ```
@@ -355,7 +355,7 @@ All configuration is via environment variables (see `.env.example`):
 
 - **Python 3.12+** + **asyncio** — Single-process async architecture
 - **FastAPI** — REST API + WebSocket server
-- **SvelteKit** — Dashboard UI (built static, served by FastAPI at `/dashboard`)
+- **SvelteKit** — Dashboard UI (built static, served by FastAPI at `/`)
 - **Sippy B2BUA** — SIP call control and DTMF
 - **PJSUA2** — Media pipeline, conference bridge, recording, WAV playback
 - **Speaches** (Whisper) — Speech-to-text