Rename the identifiers that carried the upstream name

Everything clients, users and operators meet now carries the fork's name,
with no aliases (SPEC.md §2.4, changed here from "protocol identifiers
stay"):

- JMAP: upstream's registry capability is urn:inbuxa:jmap:registry, beside
  the fork's own urn:inbuxa:jmap.
- WebDAV lock and sync tokens are urn:inbuxa:dav*; clients resync once.
- Sieve: vnd.inbuxa.while and vnd.inbuxa.expressions. sieve-rs spells these
  into its compiler, so it's vendored (vendor/sieve-rs, 0.7.3) and patched in;
  a unit test fails if Cargo.lock ever moves past the vendored copy. The
  trusted runtime now names itself too, rather than answering sieve-rs's
  default.
- The web interface's OAuth client is inbuxa-webui. On every start the old
  stalwart-webui client is removed and any application naming it is moved
  over.
- The spam filter's blobs are INBUXA_SPAM_*; every start moves any left
  under the old keys, so a trained model survives.
- SQL stores and log files default to inbuxa, in the code and in the
  schema served to the admin (checksum regenerated).
- Settings are INBUXA_* only. A STALWART_* variable that's set where its
  INBUXA_* one isn't stops the server at startup, naming it.
- The version-upgrade messages link docs.inbuxa.org's migration page, and
  the OpenAPI description, smtp crate metadata and web-push test fixtures
  lose the name.

Kept on purpose, allowlisted with reasons: the OAuth key-derivation
contexts (renaming them would end every session and invalidate every
sealed client id) and the hashed application prefix.

Also fixes a latent start-up failure: ensure_client updated an existing
first-party client with a revision of 0, which the registry's assertion
never matches, so adding a redirect URI or changing the webmail secret
failed start-up. And the principal session test now expects
legacyProtocols (C-1, added 2026-09-21), which it had missed.

Tested: the server builds without warnings; common's 106 unit tests,
including the vendoring check; a new integration test for the two
start-up migrations; and the webdav, jmap, imap and SMTP Sieve suites.

vendor/sieve-rs/Cargo.toml

@@ -0,0 +1,106 @@
+# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
+#
+# When uploading crates to the registry Cargo will automatically
+# "normalize" Cargo.toml files for maximal compatibility
+# with all versions of Cargo and also rewrite `path` dependencies
+# to registry (e.g., crates.io) dependencies.
+#
+# If you are reading this file be aware that the original Cargo.toml
+# will likely look very different (and much more reasonable).
+# See Cargo.toml.orig for the original contents.
+
+[package]
+edition = "2024"
+name = "sieve-rs"
+version = "0.7.3"
+authors = ["Stalwart Labs <[email protected]>"]
+build = false
+autolib = false
+autobins = false
+autoexamples = false
+autotests = false
+autobenches = false
+description = "Sieve filter interpreter for Rust"
+homepage = "https://github.com/stalwartlabs/sieve"
+readme = "README.md"
+keywords = [
+    "sieve",
+    "interpreter",
+    "compiler",
+    "email",
+    "mail",
+]
+categories = [
+    "email",
+    "compilers",
+]
+license = "AGPL-3.0-only"
+repository = "https://github.com/stalwartlabs/sieve"
+
+[features]
+default = []
+rkyv = [
+    "dep:rkyv",
+    "mail-parser/rkyv",
+]
+serde = [
+    "dep:serde",
+    "mail-parser/serde",
+]
+
+[lib]
+name = "sieve"
+path = "src/lib.rs"
+doctest = false
+
+[dependencies.ahash]
+version = "0.8.0"
+
+[dependencies.arc-swap]
+version = "1.7.1"
+
+[dependencies.fancy-regex]
+version = "0.19.0"
+
+[dependencies.hashify]
+version = "0.2"
+
+[dependencies.mail-builder]
+version = "0.5"
+
+[dependencies.mail-parser]
+version = "0.11"
+features = ["full_encoding"]
+
+[dependencies.rkyv]
+version = "0.8"
+optional = true
+
+[dependencies.serde]
+version = "1.0"
+features = [
+    "derive",
+    "rc",
+]
+optional = true
+
+[dev-dependencies.evalexpr]
+version = "13.1.0"
+
+[dev-dependencies.mail-parser]
+version = "0.11"
+features = [
+    "full_encoding",
+    "serde",
+    "rkyv",
+]
+
+[dev-dependencies.serde]
+version = "1.0"
+features = [
+    "derive",
+    "rc",
+]
+
+[dev-dependencies.serde_json]
+version = "1.0"