feat(v3): migrate workspace to API, Tauri desktop, and v3 crates; remove legacy MCP stack

- Add apps/api, desktop Tauri shell, domain/application/crypto/device-auth/infrastructure-db
- Replace desktop-daemon vault integration; drop secrets-core and secrets-mcp*
- Ignore apps/desktop/dist and generated Tauri icons; document icon/dist steps in AGENTS.md
- Apply rustfmt; fix clippy (collapsible_if, HTTP method as str)

crates/desktop-daemon/src/config.rs

@@ -0,0 +1,23 @@
+use anyhow::Result;
+
+#[derive(Debug, Clone)]
+pub struct DaemonConfig {
+    pub bind: String,
+}
+
+pub fn load_config() -> Result<DaemonConfig> {
+    let bind =
+        std::env::var("SECRETS_DAEMON_BIND").unwrap_or_else(|_| "127.0.0.1:9515".to_string());
+    if bind.trim().is_empty() {
+        anyhow::bail!("SECRETS_DAEMON_BIND must not be empty");
+    }
+    Ok(DaemonConfig { bind })
+}
+
+pub fn load_persisted_device_token() -> Result<Option<String>> {
+    let token = std::env::var("SECRETS_DEVICE_LOGIN_TOKEN")
+        .ok()
+        .map(|value| value.trim().to_string())
+        .filter(|value| !value.is_empty());
+    Ok(token)
+}