M9: kvitt-import Splitwise importer (SPEC §10.8, FR-17)

CLI per §10.8 with --help, --dry-run and a summary; English and Swedish
headers with member columns matched by name; CSV quoting; payments as
settlements with one allocation; trailing totals row used to reconcile
the account balance (mismatch rolls back, exit 4); non-SEK rows abort
unless --fx; committed category table data/splitwise_categories.csv;
idempotent re-runs through import_key; rows validated with the server's
push checks, audited with source import, no pushes; one BEGIN IMMEDIATE
transaction. Tests over synthetic fixtures only.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TQd3pEP9UeN2uifbHknQ7B

server/crates/kvitt-import/src/main.rs

@@ -1,20 +1,10 @@
-//! `kvitt-import`: the Splitwise CSV importer (SPEC §10.8). M9 owns this crate; in M2a it prints its usage and
-//! exits 2.
+//! `kvitt-import`: the Splitwise CSV importer (SPEC §10.8). The work is in the library (`kvitt_import`).
 
 // No unwrap/expect outside tests (CLAUDE.md server rule); integration tests are separate crates and may use them.
 #![cfg_attr(not(test), deny(clippy::unwrap_used, clippy::expect_used))]
 
 use std::process::ExitCode;
 
-// The importer reuses the server crate for database access and audit writing and the domain crate for the money
-// rules (SPEC §6.3); referenced here so the dependency edges exist from the start.
-use kvitt_domain as _;
-use kvitt_server as _;
-
-const USAGE: &str =
-    "usage: kvitt-import <options> (Splitwise CSV importer, SPEC §10.8; not implemented in M2a)";
-
 fn main() -> ExitCode {
-    eprintln!("{USAGE}");
-    ExitCode::from(2)
+    kvitt_import::cli::main()
 }