feat(llm-pi-ai): per-model reasoningEfforts and reasoning-dispatch compat switches

A model entry's reasoningEfforts dict declares its selectable thinking
levels — key = offered level, value = the wire spelling dispatch sends;
only off may leave the value empty (supported, send nothing). false
strips reasoning from a catalog model; every level is materialized
explicitly into pi-ai's thinkingLevelMap so nobody has to know pi-ai's
asymmetric absent-key defaulting. compat.thinkingFormat and
compat.supportsReasoningEffort become configurable on the route and per
model (model > route > catalog entry > pi-ai's URL-derived guess),
openai-completions only, so a private gateway speaking the DeepSeek
reasoning dialect no longer depends on its URL being recognizable.
Record-typed drift gates pin both enums to pi-ai's, and an unserviceable
declaration is refused at the write that produced it, naming route,
model, and level.

apps/web/tests/declared-reasoning.e2e.ts

@@ -0,0 +1,95 @@
+// Web e2e scenario: a hand-declared model's `reasoningEfforts` reaches the
+// composer's effort pane — the levels a settings profile declares are exactly
+// what the picker offers, and picking one records it with the default route.
+// Zero model calls: declaring, describing, and switching are settings/llm
+// traffic only, so there is no fixture and a stray stream would fail loud.
+import { readFile } from 'node:fs/promises'
+import { fileURLToPath } from 'node:url'
+import { join } from 'node:path'
+import type { Browser, Page } from 'playwright'
+import { chromium } from 'playwright'
+import { afterAll, beforeAll, describe, expect, it, onTestFailed } from 'vitest'
+import { settingsNamespace } from '@deepseek-ai/dsh-settings'
+import {
+  assertFixtureInventory, captureStableAria, compareOrRefreshGolden,
+  launchWebScaffold, watchConsole, webSnapshotMode, type WebScaffold,
+} from './scaffold.ts'
+import { ZH_BROWSER_LOCALE, connectFreshWorkspaceZh, saveFailureShot } from './support.ts'
+
+/** Starts the shipped default on this scenario's declared reasoning model. */
+const OVERLAY = fileURLToPath(new URL('./declared-reasoning.overlay.yml', import.meta.url))
+const SNAPSHOT_DIR = fileURLToPath(new URL('./snapshots/declared-reasoning', import.meta.url))
+const UI_EXPECTED = fileURLToPath(new URL('./snapshots/declared-reasoning/ui.expected.md', import.meta.url))
+const MODE = webSnapshotMode()
+
+describe.skipIf(MODE === 'record')('web e2e: declared reasoning efforts reach the composer', () => {
+  let scaffold: WebScaffold
+  let browser: Browser
+  let page: Page
+  let tripwire: ReturnType<typeof watchConsole>
+
+  beforeAll(async () => {
+    scaffold = await launchWebScaffold({ extraOverlayPath: OVERLAY })
+    // The whole reasoning offer is the profile: key = selectable level, value
+    // = the wire spelling dispatch would send (`max: ultra` renames; the
+    // valueless `off` means "supported, send nothing"). The route sets no
+    // deployment default, so the pane leads with the provider-default entry.
+    await scaffold.ctx.settings.update(settingsNamespace('llm-pi-ai'), {
+      providers: {
+        'acme-gateway': {
+          displayName: 'Acme Gateway',
+          api: 'openai-completions',
+          baseURL: 'https://gateway.acme.example/v1',
+          models: [{
+            id: 'acme-think',
+            name: 'Acme Think',
+            reasoningEfforts: { off: null, high: 'high', max: 'ultra' },
+          }],
+        },
+      },
+    })
+    browser = await chromium.launch()
+    page = await browser.newPage({ viewport: { width: 1680, height: 1000 }, locale: ZH_BROWSER_LOCALE })
+    tripwire = watchConsole(page)
+    await page.goto(scaffold.baseUrl, { waitUntil: 'load' })
+    await page.waitForSelector('[class*="frame"]', { timeout: 30_000 })
+    await connectFreshWorkspaceZh(page, scaffold.workspaceCwd)
+  }, 120_000)
+
+  afterAll(async () => {
+    await browser?.close()
+    await scaffold?.close()
+  })
+
+  it('offers exactly the declared levels and records the picked one', async () => {
+    onTestFailed(() => saveFailureShot(page, 'web-e2e-declared-reasoning'))
+    const trigger = page.getByRole('button', { name: /^选择模型/ })
+    await trigger.waitFor({ timeout: 15_000 })
+    await trigger.click()
+    await page.getByRole('menuitem', { name: /推理等级/ }).click()
+
+    // Declared levels, nothing else: the provider-default entry (the route
+    // configures no `reasoning`), then Off/High/Max — minimal, low, medium,
+    // and xhigh were not declared and must not be offered.
+    const levels = page.getByRole('menuitemradio')
+    await expect.poll(async () => levels.allTextContents(), { timeout: 10_000 })
+      .toEqual(['Default', 'Off', 'High', 'Max'])
+    const snapshot = await captureStableAria(page, '[role="menu"]', scaffold.workspaceCwd)
+    await compareOrRefreshGolden(UI_EXPECTED, snapshot, MODE)
+
+    // Picking a level is the same gesture that saves the default target, so
+    // the effort lands in the gateway's settings section beside the route.
+    await page.getByRole('menuitemradio', { name: 'High' }).click()
+    await expect.poll(
+      async () => readFile(join(scaffold.harnessHome, 'settings.yaml'), 'utf8'),
+      { timeout: 10_000 },
+    ).toContain('reasoningEffort: high')
+    await expect.poll(() => trigger.getAttribute('aria-label'), { timeout: 10_000 })
+      .toBe('选择模型，当前 Acme Think，推理等级 High')
+    expect(tripwire.pageErrors).toEqual([])
+  }, 60_000)
+
+  it('keeps its snapshot inventory closed', async () => {
+    await assertFixtureInventory(SNAPSHOT_DIR, ['ui.expected.md'])
+  })
+})

apps/web/tests/declared-reasoning.overlay.yml

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+# The fixture-less web scaffold registers no adapter, so the shipped
+# deepseek-official default would be a route nothing serves. This scenario
+# starts the default on its own declared reasoning model so the effort pane
+# describes that model from the first open.
+- id: api-gateway
+  config:
+    provider: acme-gateway
+    model: acme-think

apps/web/tests/snapshots/declared-reasoning/ui.expected.md

@@ -0,0 +1,7 @@
+- menu "模型与推理等级":
+  - menuitemradio "Default" [checked]:
+    - text: Default
+    - img
+  - menuitemradio "Off"
+  - menuitemradio "High"
+  - menuitemradio "Max"