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/client/ui-model/tests/browser-plugin.spec.ts

@@ -20,7 +20,7 @@ import { apply, inject } from '../src/client/index.ts'
 const sid = (k: string): SessionId => k as SessionId
 
 const GROUPS = [{
-  id: 'deepseek',
+  id: 'deepseek-official',
   name: 'DeepSeek',
   models: [
     {
@@ -53,7 +53,7 @@ const GROUPS = [{
 /** Boot the plugin over fake faces + a stateful fake host (current moves on selectModel). */
 async function bench() {
   const ctx = new Context()
-  let current: ModelTarget = { provider: 'deepseek', model: 'deepseek-v4-flash' }
+  let current: ModelTarget = { provider: 'deepseek-official', model: 'deepseek-v4-flash' }
   const calls = { models: 0, select: 0 }
   ctx.provide('connection', { api: { sessions: {
     models: () => {
@@ -131,17 +131,17 @@ describe('ui-model dual entry', () => {
     const seatFace = b.seat().inject!(sid('s1'))
     // Switch through the SEAT entry.
     expect(await seatFace.select({
-      provider: 'deepseek',
+      provider: 'deepseek-official',
       model: 'deepseek-v4-pro',
       reasoningEffort: 'max',
     })).toBe(true)
     expect(b.hostCurrent()).toEqual({
-      provider: 'deepseek',
+      provider: 'deepseek-official',
       model: 'deepseek-v4-pro',
       reasoningEffort: 'max',
     })
     expect(seatFace.directory.getSnapshot().current).toEqual({
-      provider: 'deepseek',
+      provider: 'deepseek-official',
       model: 'deepseek-v4-pro',
       reasoningEffort: 'max',
     })
@@ -158,7 +158,7 @@ describe('ui-model dual entry', () => {
     const pro = options.find((o: SelectOption) => o.label === 'DeepSeek-V4-Pro')!
     await b.contribution().ui.onSelect(pro, projection('s1'))
     expect(seatFace.directory.getSnapshot().current).toEqual({
-      provider: 'deepseek',
+      provider: 'deepseek-official',
       model: 'deepseek-v4-pro',
       reasoningEffort: 'high',
     })
@@ -181,14 +181,14 @@ describe('ui-model dual entry', () => {
     const b = await bench()
     b.mint('s1')
     const face = b.seat().inject!(sid('s1'))
-    await face.select({ provider: 'deepseek', model: 'deepseek-v4-pro' })
-    b.setHostCurrent({ provider: 'deepseek', model: 'deepseek-v4-flash' })
+    await face.select({ provider: 'deepseek-official', model: 'deepseek-v4-pro' })
+    b.setHostCurrent({ provider: 'deepseek-official', model: 'deepseek-v4-flash' })
 
     b.ctx.emit('connection/reset')
     expect(face.directory.getSnapshot()).toMatchObject({ current: null, status: 'loading' })
     await Promise.resolve()
     expect(face.directory.getSnapshot()).toMatchObject({
-      current: { provider: 'deepseek', model: 'deepseek-v4-flash' },
+      current: { provider: 'deepseek-official', model: 'deepseek-v4-flash' },
       status: 'ready',
     })
   })