docs: remove references to deleted OpenClaw REST facade (port 8004)

Update all documentation to reflect removal of OpenClaw REST service:
- README.md, README_zh.md: remove service table entry
- deploy/README.md: update port range 8000-8003
- services/README.md: remove 8004 references and service list
- docs/compat-removal-plan.md: remove REST surface mention
- docs/current-architecture.md: remove service reference
- docs/legacy-inventory.md: simplify to WebSocket-only description

Follow-up to: refactor(openclaw): remove REST facade

services/README.md

@@ -20,7 +20,6 @@ and the next-step execution plan lives at
 | `backend.apps.trading_service` | `8001` | Read-only trading data APIs such as prices, financials, insider trades |
 | `backend.apps.news_service` | `8002` | Read-only explain/news APIs such as story, similar days, range explain |
 | `backend.apps.runtime_service` | `8003` | Runtime lifecycle APIs under `/api/runtime/*` |
-| `backend.apps.openclaw_service` | `8004` | Read-only OpenClaw REST facade |
 | Gateway (`backend.main`) | `8765` | WebSocket feed, runtime event stream, pipeline execution |
 | OpenClaw Gateway | `18789` | External OpenClaw WebSocket endpoint consumed by 大时代 gateway |
 
@@ -63,7 +62,7 @@ That script starts:
 - `runtime_service` on `8003`
 - 大时代 gateway on `8765` (as subprocess of runtime_service)
 
-It does **not** start `openclaw_service` on `8004`.
+It does **not** start.
 
 Instead, the gateway expects an OpenClaw WebSocket server to already be
 available at `ws://localhost:18789` unless you override the OpenClaw gateway
@@ -98,7 +97,6 @@ curl -X POST http://localhost:8003/api/runtime/start \
 Optional OpenClaw REST surface:
 
 ```bash
-python -m uvicorn backend.apps.openclaw_service:app --host 0.0.0.0 --port 8004 --reload
 ```
 
 ## Runtime Responsibilities
@@ -194,7 +192,6 @@ RUNTIME_SERVICE_URL=http://localhost:8003
 OPENCLAW_SERVICE_URL=http://localhost:18789
 ```
 
-Note that `OPENCLAW_SERVICE_URL` currently points at the OpenClaw gateway origin used by the live WebSocket bridge, not the optional REST app on `:8004`.
 
 ### Frontend service targets
 
@@ -229,7 +226,6 @@ There are two separate OpenClaw integration surfaces in this repo:
 - OpenClaw WebSocket gateway on `:18789`
   - used directly by `backend/services/gateway.py`
   - this is what `start-dev.sh` assumes exists
-- `backend.apps.openclaw_service` on `:8004`
   - optional REST facade over OpenClaw CLI-backed reads
   - useful for typed client access and service-level testing
 
@@ -256,8 +252,6 @@ backend.apps.trading_service
 backend.apps.news_service
   └─ read-only explain/news contract
 
-backend.apps.openclaw_service
-  └─ optional OpenClaw REST facade
 
 backend.gateway_server
   └─ Gateway subprocess entry point (run-scoped)