Packaging: the binary and package are inbuxa, INBUXA_* settings with STALWART_* fallback

- crates/main: package and [[bin]] renamed to inbuxa; homepage inbuxa.org;
  license AGPL-3.0-only (upstream is dual; the fork takes the AGPL).
- types::branding::env_var reads INBUXA_<name>, falling back to
  STALWART_<name> with a warning, for all nine server settings.
  STALWART_APP_ and STALWART_SPAM_* storage keys are unchanged.
- New-install default paths /var/lib/inbuxa and /var/log/inbuxa.
- Dockerfiles, systemd unit, launchd plist and AppArmor profile renamed.
- Upstream's .github moved to .github-upstream so none of it runs.
- install.sh stubbed: upstream's would install Stalwart.
- Two missed brand strings: the SMTP Received header and the utils user agent.

Cargo.lock

@@ -3923,6 +3923,38 @@ dependencies = [
  "utils",
 ]
 
+[[package]]
+name = "inbuxa"
+version = "0.16.22"
+dependencies = [
+ "common",
+ "coordinator",
+ "dav",
+ "directory",
+ "email",
+ "groupware",
+ "http 0.16.22",
+ "http_proto",
+ "imap",
+ "jmap",
+ "managesieve",
+ "migration",
+ "pop3",
+ "registry",
+ "rustls",
+ "scim",
+ "services",
+ "smtp",
+ "smtp-proto",
+ "spam-filter",
+ "store",
+ "tikv-jemallocator",
+ "tokio",
+ "trc",
+ "types",
+ "utils",
+]
+
 [[package]]
 name = "include-flate"
 version = "0.3.4"
@@ -8222,38 +8254,6 @@ version = "1.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6ce2be8dc25455e1f91df71bfa12ad37d7af1092ae736f3a6cd0e37bc7810596"
 
-[[package]]
-name = "stalwart"
-version = "0.16.22"
-dependencies = [
- "common",
- "coordinator",
- "dav",
- "directory",
- "email",
- "groupware",
- "http 0.16.22",
- "http_proto",
- "imap",
- "jmap",
- "managesieve",
- "migration",
- "pop3",
- "registry",
- "rustls",
- "scim",
- "services",
- "smtp",
- "smtp-proto",
- "spam-filter",
- "store",
- "tikv-jemallocator",
- "tokio",
- "trc",
- "types",
- "utils",
-]
-
 [[package]]
 name = "static_assertions"
 version = "1.1.0"