refactor(llm-deepseek)!: rename the provider route to deepseek-official

The native adapter's route was named deepseek, colliding with pi-ai's
catalog provider of the same name, so the two DeepSeek paths could never
be mounted side by side. The web settings page needs both configurable at
once. Compositions, fixtures, goldens, scaffolding defaults, and docs all
move together (pre-release, no shim); TUI/session-query-spill/
missing-credential goldens re-recorded through their keyless refresh
modes because provider-name length shifts box padding and spill
truncation points.

packages/ui/jsonrpc/src/server.ts

@@ -55,8 +55,8 @@ function successStatus(reason: string, options: HarnessSdkServerOptions): 'ok' |
  */
 export class HarnessSdkServer {
   private cwd = process.cwd()
-  private provider = 'deepseek'
-  private model = 'deepseek'
+  private provider = 'deepseek-official'
+  private model = 'deepseek-official'
   private maxTokens: number | undefined
   private llmFiber: { dispose(): Promise<void> } | undefined
   private readonly sessions = new Map<string, SessionRecord>()
@@ -124,7 +124,7 @@ export class HarnessSdkServer {
     this.model = params.model
     this.maxTokens = params.maxTokens
     if (!this.hasAdapterFor(this.provider)) {
-      if (this.provider !== 'deepseek') throw new Error(`no adapter registered for provider "${this.provider}"`)
+      if (this.provider !== 'deepseek-official') throw new Error(`no adapter registered for provider "${this.provider}"`)
       this.llmFiber = await this.ctx.plugin(LlmDeepSeek, {})
     }
     return { serverInfo: { name: 'deepseek-harness-sdk-runtime', version: '0.0.1' } }