chore(site): add OpenRouter provider icon (#29558)

## Problem

OpenRouter is a supported provider type (AI Bridge, AI settings, model
selectors), but it had no icon. Everywhere else shows a provider logo,
OpenRouter fell back to the generic `Building2` glyph (or a question
mark in AI Bridge), which looks like a broken or unknown provider.

## Fix

Added the OpenRouter logo from [Simple
Icons](https://github.com/simple-icons/simple-icons/blob/develop/icons/openrouter.svg)
and wired it into both provider icon maps.

| File | Change |
|---|---|
| `site/static/icon/openrouter.svg` | New asset, path coordinates baked
into the repo's 256x256 viewBox with a white fill, matching
`anthropic.svg` |
| `site/src/modules/aiModels/ProviderIcon.tsx` | Map `openrouter` to the
new icon |
| `site/src/pages/AIBridgePage/icons/AIBridgeProviderIcon.tsx` | Same
mapping for the AI Bridge provider icon |
| `site/src/theme/externalImages.ts` | Register as `monochrome` so it
adapts to light and dark themes |
| `site/src/theme/icons.json` | Regenerated with `make
site/src/theme/icons.json` |
| `site/src/modules/aiModels/ProviderIcon.stories.tsx` | Add an
`OpenRouter` story, drop OpenRouter from the fallback comment |

Provider labels already existed in `formatProviderLabel` and
`addableProviderTypes`, so only the icon was missing.

## Validation

- Rendered the icon in headless Chromium on dark and light backgrounds
with the light-theme monochrome filter applied, to confirm geometry and
contrast.
- Audited all 148 icons in `site/static/icon`: every one uses a `0 0 256
256` viewBox, and 145 now carry baked coordinates with no geometry
transform. The upstream 24x24 path was scaled into 256 space so this
icon follows that convention rather than relying on a wrapper `scale()`.
The baked version renders byte-identical to the transform-based version.
- `pnpm exec tsc --noEmit`: clean
- `pnpm exec biome check` on the touched directories: clean
- `pnpm exec vitest run --project unit src/modules/aiModels
src/pages/AIBridgePage/utils.test.ts`: 185 passed

> 🤖 This PR was created with the help of Coder Agents, and needs a human
review. 🧑‍💻

site/src/modules/aiModels/ProviderIcon.stories.tsx

@@ -51,8 +51,14 @@ export const Vercel: Story = {
 	},
 };
 
-// Provider types without a bundled icon (openai-compat, openrouter, or
-// anything we don't recognize) render the generic Building2 glyph.
+export const OpenRouter: Story = {
+	args: {
+		provider: "openrouter",
+	},
+};
+
+// Provider types without a bundled icon (openai-compat or anything we don't
+// recognize) render the generic Building2 glyph.
 export const Fallback: Story = {
 	args: {
 		provider: "openai-compat",

site/src/modules/aiModels/ProviderIcon.tsx

@@ -26,6 +26,8 @@ export const getProviderIcon = (provider: string): string | undefined => {
 			return "/icon/vercel.svg";
 		case "gemini":
 			return "/icon/gemini.svg";
+		case "openrouter":
+			return "/icon/openrouter.svg";
 		default:
 			return undefined;
 	}

site/src/pages/AIBridgePage/icons/AIBridgeProviderIcon.tsx

@@ -60,6 +60,13 @@ export const AIBridgeProviderIcon = ({
 					className={cn(iconClassName, className)}
 				/>
 			);
+		case "openrouter":
+			return (
+				<ExternalImage
+					src="/icon/openrouter.svg"
+					className={cn(iconClassName, className)}
+				/>
+			);
 		default:
 			return (
 				<CircleQuestionMarkIcon

site/src/theme/externalImages.ts

@@ -179,6 +179,7 @@ export const defaultParametersForBuiltinIcons = new Map<string, string>([
 	["/icon/okta.svg", "monochrome"],
 	["/icon/openai-codex.svg", "monochrome"],
 	["/icon/openai.svg", "monochrome"],
+	["/icon/openrouter.svg", "monochrome"],
 	["/icon/openwebui.svg", "monochrome"],
 	["/icon/perplexica.svg", "monochrome"],
 	["/icon/roo-code.svg", "whiteWithColor"],

site/src/theme/icons.json

@@ -109,6 +109,7 @@
 	"openai-codex.svg",
 	"openai.svg",
 	"opencode.svg",
+	"openrouter.svg",
 	"openwebui.svg",
 	"perplexica.svg",
 	"personalize.svg",

site/static/icon/openrouter.svg

@@ -0,0 +1,3 @@
+<svg width="256" height="256" viewBox="0 0 256 256" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M178.965 19.669v20.469q-6.069-0.277-12.139-0.341-7.552-0.085-15.093 0.395c-20.587 1.344-42.912 7.765-65.589 23.861-31.051 22.037-29.131 20.8-44.16 29.333-4.224 2.379-14.315 6.123-23.307 8.512-8.971 2.4-18.699 3.552-18.677 3.552v45.109s8.192 1.152 17.173 3.552c8.981 2.389 19.083 6.133 23.307 8.523 15.04 8.512 13.099 7.285 44.16 29.333 22.677 16.096 45.013 22.507 65.579 23.851 9.387 0.619 18.304 0.437 27.253 0.053v20.459l77.035-44.459-77.035-44.48v23.211c-9.173 0.405-17.184 0.693-24.299 0.224-14.549-0.96-25.781-3.808-42.443-15.627-23.936-16.992-30.571-21.621-39.253-26.752 9.483-5.525 15.456-9.664 40.768-27.627 16.64-11.829 27.883-14.688 42.432-15.637 7.115-0.469 15.125-0.181 24.299 0.213v23.211L256 64.149Z" fill="white"/>
+</svg>