refactor(cli): split doctor/model-resolution and run/events into focused modules

Doctor checks:
- model-resolution-cache.ts, model-resolution-config.ts
- model-resolution-details.ts, model-resolution-effective-model.ts
- model-resolution-types.ts, model-resolution-variant.ts

Run events:
- event-formatting.ts, event-handlers.ts
- event-state.ts, event-stream-processor.ts

src/cli/doctor/checks/model-resolution-config.ts

@@ -0,0 +1,34 @@
+import { readFileSync } from "node:fs"
+import { homedir } from "node:os"
+import { join } from "node:path"
+import { detectConfigFile, parseJsonc } from "../../../shared"
+import type { OmoConfig } from "./model-resolution-types"
+
+const PACKAGE_NAME = "oh-my-opencode"
+const USER_CONFIG_DIR = join(homedir(), ".config", "opencode")
+const USER_CONFIG_BASE = join(USER_CONFIG_DIR, PACKAGE_NAME)
+const PROJECT_CONFIG_BASE = join(process.cwd(), ".opencode", PACKAGE_NAME)
+
+export function loadOmoConfig(): OmoConfig | null {
+  const projectDetected = detectConfigFile(PROJECT_CONFIG_BASE)
+  if (projectDetected.format !== "none") {
+    try {
+      const content = readFileSync(projectDetected.path, "utf-8")
+      return parseJsonc<OmoConfig>(content)
+    } catch {
+      return null
+    }
+  }
+
+  const userDetected = detectConfigFile(USER_CONFIG_BASE)
+  if (userDetected.format !== "none") {
+    try {
+      const content = readFileSync(userDetected.path, "utf-8")
+      return parseJsonc<OmoConfig>(content)
+    } catch {
+      return null
+    }
+  }
+
+  return null
+}