feat: inject global rules into AI system prompt and fix Rules UI seeding

- Load global rules (AIFact/AIMemory) from local CloudModel and inject
  them into the Bedrock/OpenAI system prompt as a '## Global Rules' section
  when memory is enabled.
- Fix rule seeding: always re-seed predefined rules when the CloudModel has
  none, regardless of the has_seeded_predefined_rules flag (handles case
  where flag was set but rules never persisted due to prior missing owner).
- Rename /context slash command to /copy-context: dumps the full context
  window (global rules, progressive summary, message history) to the
  clipboard for debugging.

app/src/ai/bedrock/e2e_tests.rs

@@ -1890,7 +1890,7 @@ async fn test_full_proto_round_trip_with_tool_history() {
     );
 
     let messages = super::request_translator::extract_messages_from_request(&request);
-    let system_prompt = super::request_translator::extract_system_prompt(&request);
+    let system_prompt = super::request_translator::extract_system_prompt(&request, &[]);
     let tools = super::request_translator::extract_tools(&request);
 
     println!("\n=== FULL PROTO ROUND-TRIP TEST ===");