refactor(providers): one record per provider, one place for the key-and-URL decision (#988)

Every fact about a provider lives in one record in lib/providers.ts (SDK kind,
credential kind, env var prefix, default URL, picker group, four-language
notes, and a short model list for the six providers that cannot list models).
The thirteen tables keyed by provider name are gone. resolveEndpoint decides
whose key a call uses and where it goes; usesServerCredentials reads its
answer instead of mirroring getAIModel's branches; serverCredentialError holds
the server credential check once. The UI, the connection test and the routes
read the record's credential and sdk fields instead of comparing provider
names (44 such checks before, 6 after, in the admin panel's fixed-variable
branches).

Intended behavior changes: providers that can list their models have no
hand-written list; the settings dialog fetches the live list in the background
once credentials are entered for a provider without models and offers it
behind "Browse models". Azure has no placeholder default URL (old entries that
hold it still count as unset); the base URL field of Azure and of the new
"custom" OpenAI-compatible preset (CUSTOM_API_KEY, CUSTOM_BASE_URL) is
labelled required. The connection test answers 400 for an unknown provider
name; prototype names are refused everywhere. Provider lists in error messages
and the admin "add provider" dropdown follow the picker's order.

Also fixed, from before the refactor: the redirect guard drops x-access-code
on cross-origin redirects, and edgeOneEndpoint accepts the Origin header only
when it matches Host or X-Forwarded-Host.

Verification: a behavior snapshot of getAIModel's SDK factory calls and the
quota functions over 25 providers, 22 client override shapes and 9 server
environments (5843 rows), recorded on the old code and unchanged apart from
the intended changes; 752 unit tests, 65 provider e2e tests, tsc, biome,
next build. Reviewed by five models from one brief; their findings and the
resulting fixes are recorded in docs/plans/2026-10-provider-refactor.md.

tests/unit/validate-model-route.test.ts

@@ -382,3 +382,28 @@ describe("the Test on the deployment's own endpoints", () => {
         expect(quota.checks).toBe(0)
     })
 })
+
+describe("POST /api/validate-model with an unknown provider", () => {
+    const send = (body: object) =>
+        validateModel(
+            new Request("http://localhost/api/validate-model", {
+                method: "POST",
+                headers: { "Content-Type": "application/json" },
+                body: JSON.stringify({ modelId: "m", ...body }),
+            }),
+        )
+
+    it("refuses a name that is not a provider, with or without a key", async () => {
+        for (const body of [
+            { provider: "nope", apiKey: "k" },
+            { provider: "nope" },
+            // A prototype property is not a provider either
+            { provider: "toString", apiKey: "k" },
+        ]) {
+            const res = await send(body)
+            expect(res.status).toBe(400)
+            const { error } = await res.json()
+            expect(error).toMatch(/^Invalid provider: /)
+        }
+    })
+})