feat: added providers management settings with ability to add or remove providers (#76)

* feat: implement adding opencode providers in openchamber settings

* feat: implement provider authentication management with removal functionality

packages/vscode/src/opencodeAuth.ts

@@ -0,0 +1,72 @@
+import fs from 'node:fs';
+import path from 'node:path';
+import os from 'node:os';
+
+const OPENCODE_DATA_DIR = path.join(os.homedir(), '.local', 'share', 'opencode');
+const AUTH_FILE = path.join(OPENCODE_DATA_DIR, 'auth.json');
+
+type AuthEntry = Record<string, unknown>;
+type AuthFile = Record<string, AuthEntry>;
+
+const readAuthFile = (): AuthFile => {
+  if (!fs.existsSync(AUTH_FILE)) {
+    return {};
+  }
+  try {
+    const content = fs.readFileSync(AUTH_FILE, 'utf8');
+    const trimmed = content.trim();
+    if (!trimmed) {
+      return {};
+    }
+    return JSON.parse(trimmed) as AuthFile;
+  } catch (error) {
+    console.error('Failed to read auth file:', error);
+    throw new Error('Failed to read OpenCode auth configuration');
+  }
+};
+
+const writeAuthFile = (auth: AuthFile): void => {
+  try {
+    if (!fs.existsSync(OPENCODE_DATA_DIR)) {
+      fs.mkdirSync(OPENCODE_DATA_DIR, { recursive: true });
+    }
+
+    if (fs.existsSync(AUTH_FILE)) {
+      const backupFile = `${AUTH_FILE}.openchamber.backup`;
+      fs.copyFileSync(AUTH_FILE, backupFile);
+    }
+
+    fs.writeFileSync(AUTH_FILE, JSON.stringify(auth, null, 2), 'utf8');
+  } catch (error) {
+    console.error('Failed to write auth file:', error);
+    throw new Error('Failed to write OpenCode auth configuration');
+  }
+};
+
+export const removeProviderAuth = (providerId: string): boolean => {
+  if (!providerId || typeof providerId !== 'string') {
+    throw new Error('Provider ID is required');
+  }
+
+  const auth = readAuthFile();
+
+  if (!auth[providerId]) {
+    return false;
+  }
+
+  delete auth[providerId];
+  writeAuthFile(auth);
+  return true;
+};
+
+export const getProviderAuth = (providerId: string): AuthEntry | null => {
+  const auth = readAuthFile();
+  return auth[providerId] || null;
+};
+
+export const listProviderAuths = (): string[] => {
+  const auth = readAuthFile();
+  return Object.keys(auth);
+};
+
+export { AUTH_FILE, OPENCODE_DATA_DIR };