fix(deepseek,model-catalog): vision for V4.1-Flash ids, scope synced catalog to gateways

- Declare deepseek-v4.1-flash and deepseek-flash as vision-capable in MODEL_CAPABILITIES
- Share installed catalogSource across route chunks via globalThis.__9rCatalogSource
- Scope catalog modality keys by provider:model to prevent cross-gateway collisions
- Upgrade catalog format to v2 with automatic rebuild of older schemas

tests/unit/capabilities.test.js

@@ -2,6 +2,24 @@ import { describe, expect, it } from "vitest";
 import { getCapabilitiesForModel } from "../../open-sse/providers/capabilities.js";
 
 describe("getCapabilitiesForModel", () => {
+
+  it("reports DeepSeek V4.1-Flash ids as vision-capable without dropping their thinking/context", () => {
+    const v41 = { vision: true, reasoning: true, thinkingFormat: "deepseek", contextWindow: 1000000, maxOutput: 384000 };
+    expect(getCapabilitiesForModel(undefined, "deepseek-v4.1-flash")).toMatchObject(v41);
+    expect(getCapabilitiesForModel("opencode-go", "deepseek-v4.1-flash")).toMatchObject(v41);
+    expect(getCapabilitiesForModel("openrouter", "deepseek/deepseek-v4.1-flash")).toMatchObject(v41);
+    // "deepseek-flash" is the GA id for V4.1-Flash on the DeepSeek API; the pattern it
+    // used to fall through to gives it 128K/64K, which the exact entry keeps.
+    expect(getCapabilitiesForModel("opencode-go", "deepseek-flash")).toMatchObject({
+      vision: true,
+      reasoning: true,
+      thinkingFormat: "deepseek",
+      contextWindow: 128000,
+      maxOutput: 64000,
+    });
+    // the superseded text-only Flash id stays text-only
+    expect(getCapabilitiesForModel("opencode-go", "deepseek-v4-flash").vision).toBe(false);
+  });
   const claudeSonnet5Expected = {
     contextWindow: 1000000,
     maxOutput: 128000,