Extract data_server into external data-server crate

The data_server module had no dependency on the rest of myc (only
chrono/regex/zip), so it was moved verbatim into a standalone leaf
crate at its own Gitea repo and is now consumed as a git dependency.
A 'pub use ::data_server;' re-export in src/ast/mod.rs keeps all
existing myc::ast::data_server::… paths valid; no call sites changed.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Cargo.lock

@@ -994,6 +994,16 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "data-server"
+version = "0.1.0"
+source = "git+http://192.168.178.103:3000/Brummel/data-server.git?branch=main#c0b1268e14245d11d32def39517cbcf77c731aea"
+dependencies = [
+ "chrono",
+ "regex",
+ "zip",
+]
+
 [[package]]
 name = "deflate64"
 version = "0.1.12"
@@ -1821,7 +1831,7 @@ dependencies = [
  "js-sys",
  "log",
  "wasm-bindgen",
- "windows-core 0.61.2",
+ "windows-core 0.58.0",
 ]
 
 [[package]]
@@ -2257,6 +2267,7 @@ version = "0.1.0"
 dependencies = [
  "chrono",
  "clap",
+ "data-server",
  "eframe",
  "egui_extras",
  "fastrand",