Façade Rust, lot 2 : interface, authentification et /api/ping

L'interface (index, marked, service worker, manifeste, polices) est
désormais servie par loki-rs, embarquée par build.rs depuis la même source
que le go:embed — les deux binaires d'un build servent la même UI. Mêmes
en-têtes de cache que le Go, gzip à la première demande puis gardé en
mémoire, jamais sur les polices ni en HEAD.

L'authentification de pilotage est portée à l'identique (requireWebAuth,
crossSiteReject, localHostName, Bearer en temps constant, mêmes messages,
mêmes codes) ; les cas de TestCrossSiteReject sont repris un pour un. La
clé est demandée à l'API interne du Go à chaque requête ; si elle ne
répond pas proprement, la façade ferme (503). /api/ping est la première
route authentifiée servie par Rust.

Le jeton de l'API interne est tiré au hasard à chaque démarrage et passé
au Go par l'environnement. La façade rend 404 sur /internal/* venu de
l'extérieur et efface X-Loki-Internal entrant avant tout relais.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

rust/Cargo.lock

@@ -2,6 +2,12 @@
 # It is not intended for manual editing.
 version = 4
 
+[[package]]
+name = "adler2"
+version = "2.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "320119579fcad9c21884f5c4861d16174d0e06250625266f50fe6898340abefa"
+
 [[package]]
 name = "atomic-waker"
 version = "1.1.2"
@@ -61,6 +67,15 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "crc32fast"
+version = "1.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "01a7799fd6b852db0e61728dde9a204c423b44d689dbd432522543614b490e78"
+dependencies = [
+ "cfg-if",
+]
+
 [[package]]
 name = "crypto-common"
 version = "0.2.2"
@@ -103,6 +118,17 @@ version = "2.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "da7c62ceae207dd37ea5b845da6a0696c799f85e97da1ab5b7910be3c1c80223"
 
+[[package]]
+name = "flate2"
+version = "1.1.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6e634e2e0ebac1ee034020da1ca582e17ffe4e0f5e985823721e168928136dcb"
+dependencies = [
+ "crc32fast",
+ "miniz_oxide",
+ "zlib-rs",
+]
+
 [[package]]
 name = "futures-channel"
 version = "0.3.34"
@@ -297,7 +323,9 @@ name = "loki-rs"
 version = "0.1.0"
 dependencies = [
  "bytes",
+ "flate2",
  "futures-util",
+ "getrandom",
  "hex",
  "http-body-util",
  "hyper",
@@ -317,6 +345,16 @@ version = "2.8.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf8baf1c55e62ffcace7a9f06f4bd9cd3f0c4beb022d3b367256b91b87513d98"
 
+[[package]]
+name = "miniz_oxide"
+version = "0.9.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b63fbc4a50860e98e7b2aa7804ded1db5cbc3aff9193adaff57a6931bf7c4b4c"
+dependencies = [
+ "adler2",
+ "simd-adler32",
+]
+
 [[package]]
 name = "mio"
 version = "1.2.4"
@@ -469,6 +507,12 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "simd-adler32"
+version = "0.3.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3a219298ac11a56ea9a6d2120044824d6f01aeb034955e7af7bc16858527deea"
+
 [[package]]
 name = "slab"
 version = "0.4.12"
@@ -663,6 +707,12 @@ dependencies = [
  "windows-link",
 ]
 
+[[package]]
+name = "zlib-rs"
+version = "0.6.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b268e58e7c693d7c271f93ffc4ba3b380412554231c85bf61ca7af91042a4112"
+
 [[package]]
 name = "zmij"
 version = "1.0.23"