feat(ai): add Xiaomi MiMo provider (#4005)

* fix(ai): include minimax-cn in cross-provider-handoff matrix

* feat(ai): add Xiaomi MiMo provider

Adds Xiaomi MiMo as an openai-completions-compatible provider.

- packages/ai: register provider in types/KnownProvider, env-api-keys (XIAOMI_API_KEY), generate-models, models.generated.ts, overflow util, README, CHANGELOG
- packages/ai/test: extend stream, tokens, abort, empty, context-overflow, overflow, image-tool-result, tool-call-without-result, total-tokens, unicode-surrogate, cross-provider-handoff matrices with Xiaomi
- packages/coding-agent: default model (mimo-v2.5-pro), display name (Xiaomi MiMo), CLI env var docs, README, docs/providers.md

closes #3912

---------

Co-authored-by: Mario Zechner <badlogicgames@gmail.com>

packages/ai/src/models.generated.ts

@@ -16231,6 +16231,93 @@ export const MODELS = {
 			maxTokens: 4096,
 		} satisfies Model<"openai-completions">,
 	},
+	"xiaomi": {
+		"mimo-v2-flash": {
+			id: "mimo-v2-flash",
+			name: "MiMo-V2-Flash",
+			api: "openai-completions",
+			provider: "xiaomi",
+			baseUrl: "https://api.xiaomimimo.com/v1",
+			reasoning: true,
+			input: ["text"],
+			cost: {
+				input: 0.1,
+				output: 0.3,
+				cacheRead: 0.01,
+				cacheWrite: 0,
+			},
+			contextWindow: 256000,
+			maxTokens: 64000,
+		} satisfies Model<"openai-completions">,
+		"mimo-v2-omni": {
+			id: "mimo-v2-omni",
+			name: "MiMo-V2-Omni",
+			api: "openai-completions",
+			provider: "xiaomi",
+			baseUrl: "https://api.xiaomimimo.com/v1",
+			reasoning: true,
+			input: ["text", "image"],
+			cost: {
+				input: 0.4,
+				output: 2,
+				cacheRead: 0.08,
+				cacheWrite: 0,
+			},
+			contextWindow: 256000,
+			maxTokens: 128000,
+		} satisfies Model<"openai-completions">,
+		"mimo-v2-pro": {
+			id: "mimo-v2-pro",
+			name: "MiMo-V2-Pro",
+			api: "openai-completions",
+			provider: "xiaomi",
+			baseUrl: "https://api.xiaomimimo.com/v1",
+			reasoning: true,
+			input: ["text"],
+			cost: {
+				input: 1,
+				output: 3,
+				cacheRead: 0.2,
+				cacheWrite: 0,
+			},
+			contextWindow: 1000000,
+			maxTokens: 128000,
+		} satisfies Model<"openai-completions">,
+		"mimo-v2.5": {
+			id: "mimo-v2.5",
+			name: "MiMo-V2.5",
+			api: "openai-completions",
+			provider: "xiaomi",
+			baseUrl: "https://api.xiaomimimo.com/v1",
+			reasoning: true,
+			input: ["text"],
+			cost: {
+				input: 0.4,
+				output: 2,
+				cacheRead: 0.08,
+				cacheWrite: 0,
+			},
+			contextWindow: 1048576,
+			maxTokens: 131072,
+		} satisfies Model<"openai-completions">,
+		"mimo-v2.5-pro": {
+			id: "mimo-v2.5-pro",
+			name: "MiMo-V2.5-Pro",
+			api: "openai-completions",
+			provider: "xiaomi",
+			baseUrl: "https://api.xiaomimimo.com/v1",
+			reasoning: true,
+			input: ["text", "image"],
+			cost: {
+				input: 1,
+				output: 3,
+				cacheRead: 0.2,
+				cacheWrite: 0,
+			},
+			contextWindow: 1048576,
+			maxTokens: 131072,
+		} satisfies Model<"openai-completions">,
+	},
 	"zai": {
 		"glm-4.5-air": {
 			id: "glm-4.5-air",