docs: add project logo to README and adjust table formatting.

README.md

@@ -1,5 +1,9 @@
 # ZeroGravity
 
+<p align="center">
+  <img src="assets/logo.png" alt="ZeroGravity" width="200" />
+</p>
+
 OpenAI-compatible proxy that intercepts and relays requests to Google's Antigravity language server, impersonating the real Electron webview.
 
 ```mermaid
@@ -32,7 +36,7 @@ zg start
 ## Endpoints
 
 | Method     | Path                              | Description                            |
-| ---------- | --------------------------------- | ------------------------------------ |
+| ---------- | --------------------------------- | -------------------------------------- |
 | `POST`     | `/v1/responses`                   | Responses API (sync + streaming)       |
 | `POST`     | `/v1/chat/completions`            | Chat Completions API (OpenAI compat)   |
 | `POST`     | `/v1beta/models/{model}:{action}` | Official Gemini v1beta routes          |
@@ -56,7 +60,7 @@ The proxy needs an OAuth token:
 ## `zg` Commands
 
 | Command         | Description                    |
-| --------------------- | ------------------------------ |
+| --------------- | ------------------------------ |
 | `zg start`      | Start the proxy daemon         |
 | `zg stop`       | Stop the proxy daemon          |
 | `zg restart`    | Rebuild + restart              |