refactor: rename files to PascalCase components and kebab-case APIs (Task 4.4)

- Rename all component files to PascalCase matching exported names
- Move components into feature directories (git/, session/, project/, terminal/, workspace/, ui/, layout/)
- Rename all page files to PascalCase with Page suffix
- Rename all API files to kebab-case
- Update all imports across codebase with corrected relative depths
- Preserve git history via git mv

Quality gates: tsc (pass), eslint (pass), 66/74 tests pass (8 pre-existing failures)
Refs: repo-restructure Task 4.4

apps/web/src/api/ssh-keys.ts

@@ -0,0 +1,26 @@
+import { apiClient } from "./client";
+
+export interface SSHKey {
+  id: string;
+  name: string;
+  public_key: string;
+  created_at: string;
+}
+
+export interface SSHKeyCreate {
+  name: string;
+}
+
+export async function listSSHKeys(): Promise<SSHKey[]> {
+  const response = await apiClient.get<SSHKey[]>("/ssh-keys");
+  return response.data;
+}
+
+export async function createSSHKey(data: SSHKeyCreate): Promise<SSHKey> {
+  const response = await apiClient.post<SSHKey>("/ssh-keys", data);
+  return response.data;
+}
+
+export async function deleteSSHKey(keyId: string): Promise<void> {
+  await apiClient.delete(`/ssh-keys/${keyId}`);
+}