Implement path-based downloads with blob redirect system

- Add fctdrive stat command to get blob IDs from paths
- Add Drive_stat function to drive_server.ts for backend integration
- Create /download/[...path] endpoint that redirects to /blob/{blobId}
- Update UI file links to use /download/ paths instead of direct blob links
- Update permalinks to use immutable /blob/{blobId} URLs
- Fix host preservation in redirects for remote access

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

1 files changed, 12 insertions, 0 deletions

diff --git a/frontend/lib/drive_server.ts b/frontend/lib/drive_server.ts
index 2a94fe9..41b9c71 100644
--- a/frontend/lib/drive_server.ts
+++ b/frontend/lib/drive_server.ts
@@ -108,6 +108,18 @@ export async function Drive_rename(oldPath: string, newPath: string, email: stri
   }
 }
 
+/// gets the blob ID for a given path
+export async function Drive_stat(path: string): Promise<string> {
+  const result = spawnSync('fctdrive', ['stat', path], { encoding: 'utf-8' });
+  if (result.error) {
+    throw new Error(`Failed to execute fctdrive: ${result.error.message}`);
+  }
+  if (result.status !== 0) {
+    throw new Error(`fctdrive exited with code ${result.status}: ${result.stderr}`);
+  }
+  return result.stdout.trim();
+}
+
 /// builds a filesystem tree from Drive_ls entries
 export async function Drive_tree(): Promise<DriveTreeResponse> {
   const entries = await Drive_ls('/', true);