Fix dashboard wasm build and feature-gate mongodb for wasm compatibility

- Feature-gate mongodb in compliance-core (optional, default on) so wasm
  builds don't pull in tokio/mio via mongodb
- Use bson v2 directly for ObjectId types (wasm-compatible)
- Restructure dashboard infrastructure/mod.rs: server function modules
  always compiled (for RPC stubs), server-only modules cfg-gated
- Remove reqwest from dashboard web feature (not needed, data flows
  through server functions)
- Add .gitignore

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

compliance-dashboard/src/infrastructure/mod.rs

@@ -1,13 +1,23 @@
-pub mod config;
-pub mod database;
-pub mod error;
+// Server function modules (compiled for both web and server;
+// the #[server] macro generates client stubs for the web target)
 pub mod findings;
 pub mod issues;
 pub mod repositories;
 pub mod sbom;
 pub mod scans;
-pub mod server;
-pub mod server_state;
 pub mod stats;
 
+// Server-only modules
+#[cfg(feature = "server")]
+pub mod config;
+#[cfg(feature = "server")]
+pub mod database;
+#[cfg(feature = "server")]
+pub mod error;
+#[cfg(feature = "server")]
+pub mod server;
+#[cfg(feature = "server")]
+pub mod server_state;
+
+#[cfg(feature = "server")]
 pub use server::server_start;

compliance-dashboard/src/lib.rs

@@ -1,8 +1,6 @@
 pub mod app;
 pub mod components;
+pub mod infrastructure;
 pub mod pages;
 
-#[cfg(feature = "server")]
-pub mod infrastructure;
-
 pub use app::App;