Revert "Adds Google Drive API support and Service Account Auth"

.gitignore

@@ -8,5 +8,4 @@ node_modules/
 .DS_Store
 /blob-report/
 /dist/
-/cache/
-google.json
+/cache/

docs/rest-api.md

@@ -49,19 +49,6 @@ X-Anthropic-Token: sk-ant-api03-...
    - File content - Read only
    - File comments - Read only
 
-**Google Service Account** (for drive-about-user endpoint):
-
-See the [Google Service Account Setup Guide](./google-service-account.md) for detailed instructions with screenshots.
-
-⚠️ **CRITICAL SECURITY WARNING**: Service account keys do NOT expire and provide full access to shared resources. The X-Google-Json header should ONLY be used in secure, server-to-server environments. Never expose this endpoint to client-side applications.
-
-Quick setup:
-1. Create service account in [Google Cloud Console](https://console.cloud.google.com/)
-2. Enable Google Drive API
-3. Create and download JSON key
-4. Share Google Drive files with the service account email
-5. Use the JSON content in the `X-Google-Json` header
-
 **Anthropic API Key:**
 1. Go to https://console.anthropic.com/settings/keys
 2. Create an API key
@@ -300,93 +287,6 @@ while (true) {
 console.log(`Total stories written: ${storiesWritten}`);
 ```
 
----
-
-### Drive About User (Google Service Account)
-
-Get authenticated user information from Google Drive using service account credentials.
-
-🚨 **TEMPORARY PROOF OF CONCEPT** - The `X-Google-Json` header currently accepts unencrypted service account credentials and will be replaced with an encrypted key mechanism soon. Only use for internal testing and local development. See [Google Service Account Setup Guide](./google-service-account.md) for details.
-
-**Endpoint:** `POST /api/drive-about-user`
-
-**Headers:**
-- `Content-Type: application/json`
-- `X-Google-Json` (required) - Service account JSON as string
-
-**Request Body:**
-```json
-{}
-```
-
-**Parameters:**
-- None (empty request body)
-
-**Success Response (200 OK):**
-```json
-{
-  "user": {
-    "kind": "drive#user",
-    "displayName": "cascade-mcp-drive",
-    "emailAddress": "[email protected]",
-    "permissionId": "12345678901234567890",
-    "photoLink": "https://lh3.googleusercontent.com/...",
-    "me": true
-  }
-}
-```
-
-**Error Response (401 Unauthorized):**
-```json
-{
-  "error": "Missing credentials header",
-  "details": "Please provide credentials via X-Google-Json header (plaintext service account JSON)"
-}
-```
-
-**Example using curl:**
-```bash
-# Load service account JSON from file
-# Note: The JSON must be passed as a single-line string in the header
-curl -X POST http://localhost:3000/api/drive-about-user \
-  -H "Content-Type: application/json" \
-  -H "X-Google-Json: $(cat google.json | tr -d '\n')" \
-  -d '{}'
-
-# Alternative: Use a variable to avoid shell escaping issues
-GOOGLE_JSON=$(cat google.json | tr -d '\n')
-curl -X POST http://localhost:3000/api/drive-about-user \
-  -H "Content-Type: application/json" \
-  -H "X-Google-Json: $GOOGLE_JSON" \
-  -d '{}'
-```
-
-**Example using Node.js:**
-```javascript
-const fs = require('fs');
-
-// Load service account JSON
-const serviceAccountJson = fs.readFileSync('./google.json', 'utf-8');
-
-const response = await fetch('http://localhost:3000/api/drive-about-user', {
-  method: 'POST',
-  headers: {
-    'Content-Type': 'application/json',
-    'X-Google-Json': serviceAccountJson,
-  },
-  body: JSON.stringify({}),
-});
-
-const data = await response.json();
-console.log(`User: ${data.user.displayName}`);
-console.log(`Email: ${data.user.emailAddress}`);
-console.log(`Permission ID: ${data.user.permissionId}`);
-```
-
-For more information, see the [Google Service Account Setup Guide](./google-service-account.md).
-
----
-
 ## Error Handling
 
 All endpoints return JSON responses with appropriate HTTP status codes: