feat(connectors): add Ollama and LM Studio as a local auth kind

Both servers expose OpenAI-compatible /v1/chat/completions and /v1/models,
so we route them through pi-ai's `openai-completions` API the same way
Fireworks does — but with a per-installation base URL the user enters
during onboarding instead of a hardcoded one. The shared schemas grow a
`local` credential payload carrying just the baseUrl; the credential
resolver surfaces it on `ResolvedCredential.baseUrl`, the runtime bridge
forwards it through `prepareRun`, and the worker plumbs it into
`resolveModel` so the streamed Model<openai-completions> targets the
user's server. The local-cost path short-circuits to zero in cost-writer
since users bill their own hardware, and the live model list is fetched
from the saved baseUrl by `fetchLocalConnectorModels` (Ollama and LM
Studio both speak the standard OpenAI catalog shape). Onboarding ships
a new LocalProviderCard and the Settings panel a LocalForm; both default
to the catalog's per-connector localhost URL and accept any custom URL.

src/main/database/credentials.ts

@@ -2,7 +2,7 @@ import type { DatabaseSync } from "node:sqlite";
 import type { ReadAll, Transaction } from "./helpers";
 import { nowIso } from "./helpers";
 
-export type CredentialKind = "oauth" | "api_key" | "aws" | "azure" | "gcp_adc";
+export type CredentialKind = "oauth" | "api_key" | "aws" | "azure" | "gcp_adc" | "local";
 export type CredentialStatus = "active" | "expired" | "revoked" | "error";
 export type CredentialBackend = "safe_storage" | "vault";