fix(.gitignore): anchor Python build artifacts; recover panel/src/lib (28 files)

The 'lib/' rule (intended for Python virtualenv at repo root) was matching panel/src/lib/, hiding the entire panel API client + utility tree from git. Anchored Python build-artifact rules to the repo root with a leading slash so they only match at the top level. Adds 28 panel/src/lib files that should have been tracked from day one.

panel/src/lib/api/providers.ts

@@ -0,0 +1,68 @@
+import api from "./client";
+import type {
+  AssignmentScope,
+  ModelProvider,
+} from "@/types";
+
+// Matches the backend's CatalogEntryResponse.
+export interface CatalogEntry {
+  model_name: string;
+  provider_type: ModelProvider;
+  display_name: string;
+}
+
+export interface OllamaKeyStatus {
+  has_key: boolean;
+  enabled: boolean;
+}
+
+export interface ModelAssignment {
+  id: string;
+  scope: AssignmentScope;
+  scope_value: string | null;
+  provider_type: ModelProvider;
+  model_name: string;
+}
+
+export type RoutingMode = "anthropic" | "ollama" | "mix";
+
+export interface ModeSnapshot {
+  mode: RoutingMode;
+  assignments: ModelAssignment[];
+}
+
+export interface ApplyModePayload {
+  mode: RoutingMode;
+  default_model?: string;
+  // Required when mode=mix: map of agent_slug → model_name.
+  per_agent?: Record<string, string>;
+}
+
+export const providersApi = {
+  catalog: async (): Promise<CatalogEntry[]> => {
+    const { data } = await api.get<CatalogEntry[]>("/providers/catalog");
+    return data;
+  },
+
+  getOllamaKey: async (): Promise<OllamaKeyStatus> => {
+    const { data } = await api.get<OllamaKeyStatus>("/providers/ollama-key");
+    return data;
+  },
+
+  setOllamaKey: async (apiKey: string): Promise<OllamaKeyStatus> => {
+    const { data } = await api.put<OllamaKeyStatus>("/providers/ollama-key", {
+      api_key: apiKey,
+    });
+    return data;
+  },
+
+  getMode: async (): Promise<ModeSnapshot> => {
+    const { data } = await api.get<ModeSnapshot>("/providers");
+    return data;
+  },
+
+  applyMode: async (payload: ApplyModePayload): Promise<ModeSnapshot> => {
+    const { data } = await api.post<ModeSnapshot>("/providers", payload);
+    return data;
+  },
+};