feat: embed daemon JS in binary, eliminate npm install of camoufox-browser

The daemon JS files (daemon.js, server.js, browser.js, protocol.js,
snapshot.js, ipc.js) are now EMBEDDED in the compiled Rust binary via
include_dir! and extracted to ~/.gyandoot/daemon/ on first run.

This eliminates the need to npm install -g camoufox-browser@0.1.0,
which bundles an incompatible camoufox-js@0.9.3 that caused:
- 'Cannot open database' errors
- Re-downloading 298MB browser on every navigation
- Circular install/remove/install loops

Now the daemon imports camoufox-js from the global npm install (v0.11.0)
which is installed by install.sh. Clean, no bundled deps, no conflicts.

Also removed: is_npm_package_installed(), install_npm_package(),
find_daemon_js() — all replaced by gyandoot_browser::daemon::extract_daemon()

crates/gyandoot-browser/Cargo.toml

@@ -16,4 +16,5 @@ tracing.workspace = true
 uuid.workspace = true
 chrono.workspace = true
 dirs.workspace = true
-reqwest = { workspace = true, default-features = false, features = ["json"] }
+reqwest = { workspace = true, default-features = false, features = ["json"] }
+include_dir = "0.7"