persistent auth in SQLite, API chat/logs, agent completion via channel

- Auth: move from state.json to SQLite authed_chats table, with memory cache
- Remove Persistent/state.json, all state now in noc.db
- HTTP API: POST /api/chat (end-to-end LLM), GET /api/logs (failed API requests)
- API logging: store raw request/response for 400 errors in api_log table
- Agent completion: spawn_agent sends LifeEvent::AgentDone via channel,
  life loop picks up with full conversation context and responds
- Config structs: derive Clone for HTTP server
- System prompt: instruct LLM not to add timestamps
- Makefile: rsync without --delete to preserve VPS-only tools

src/config.rs

@@ -1,6 +1,6 @@
 use serde::Deserialize;
 
-#[derive(Deserialize)]
+#[derive(Deserialize, Clone)]
 pub struct Config {
     #[serde(default = "default_name")]
     pub name: String,
@@ -71,17 +71,17 @@ fn default_api_key() -> String {
     "unused".to_string()
 }
 
-#[derive(Deserialize)]
+#[derive(Deserialize, Clone)]
 pub struct TgConfig {
     pub key: String,
 }
 
-#[derive(Deserialize)]
+#[derive(Deserialize, Clone)]
 pub struct AuthConfig {
     pub passphrase: String,
 }
 
-#[derive(Deserialize)]
+#[derive(Deserialize, Clone)]
 pub struct SessionConfig {
     pub refresh_hour: u32,
 }