smcli: login-item support + convert command (notes -> username/password/apikey)

Founder follow-up: lifted items restructured to proper login items
(first-class username/password/URIs, remainder as named custom fields).
Classified from the env-key semantics; zero data loss.
Ticket: https://projects.knownelement.com/issues/829

cli/cmd/smcli/api.go

@@ -85,10 +85,10 @@ func truncate(s string, n int) string {
 }
 
 type preloginResp struct {
-	KDF             int    `json:"kdf"`
-	KDFIterations   uint32 `json:"kdfIterations"`
-	KDFMemory       uint32 `json:"kdfMemory"`
-	KDFParallelism  uint32 `json:"kdfParallelism"`
+	KDF            int    `json:"kdf"`
+	KDFIterations  uint32 `json:"kdfIterations"`
+	KDFMemory      uint32 `json:"kdfMemory"`
+	KDFParallelism uint32 `json:"kdfParallelism"`
 }
 
 func (c *Client) Prelogin() error {
@@ -225,8 +225,6 @@ func (c *Client) EditCipher(id string, cipherJSON any) ([]byte, error) {
 	return c.api("PUT", "/api/ciphers/"+id, cipherJSON, true)
 }
 
-
-
 func deviceID() string {
 	// stable per machine: hash of hostname (no secrets involved)
 	hn := hostnameSafe()