perf(api,indexer): optimiser pages, thumbnails, watcher et robustesse fd

- Pages: mode Original (zero-transcoding), ETag/304, cache index CBZ,
  préfetch next 2 pages, filtre Triangle par défaut
- Thumbnails: DCT scaling JPEG via jpeg-decoder (decode 7x plus rapide),
  img.thumbnail() pour resize, support format Original, fix JPEG RGBA8
- API fallback thumbnail: OutputFormat::Original + DCT scaling au lieu
  de WebP full-decode, retour (bytes, content_type) dynamique
- Watcher: remplacement notify par poll léger sans inotify/fd,
  skip poll quand job actif, snapshots en mémoire
- Jobs: mutex exclusif corrigé (tous statuts actifs, tous types exclusifs)
- Robustesse: suppression fs::canonicalize (problèmes fd Docker),
  list_folders avec erreurs explicites, has_children default true
- Backoffice: FormRow items-start pour alignement inputs avec helper text,
  labels settings clarifiés

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Cargo.lock

@@ -61,6 +61,7 @@ dependencies = [
  "chrono",
  "futures",
  "image",
+ "jpeg-decoder",
  "lru",
  "parsers",
  "rand 0.8.5",
@@ -215,12 +216,6 @@ version = "1.8.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2af50177e190e07a26ab74f8b1efbfe2ef87da2116221318cb1c2e82baf7de06"
 
-[[package]]
-name = "bitflags"
-version = "1.3.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
-
 [[package]]
 name = "bitflags"
 version = "2.11.0"
@@ -634,15 +629,6 @@ dependencies = [
  "percent-encoding",
 ]
 
-[[package]]
-name = "fsevent-sys"
-version = "4.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "76ee7a02da4d231650c7cea31349b889be2f45ddb3ef3032d2ec8185f6313fd2"
-dependencies = [
- "libc",
-]
-
 [[package]]
 name = "futures"
 version = "0.3.32"
@@ -1143,7 +1129,7 @@ dependencies = [
  "chrono",
  "futures",
  "image",
- "notify",
+ "jpeg-decoder",
  "num_cpus",
  "parsers",
  "rayon",
@@ -1173,26 +1159,6 @@ dependencies = [
  "serde_core",
 ]
 
-[[package]]
-name = "inotify"
-version = "0.11.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bd5b3eaf1a28b758ac0faa5a4254e8ab2705605496f1b1f3fbbc3988ad73d199"
-dependencies = [
- "bitflags 2.11.0",
- "inotify-sys",
- "libc",
-]
-
-[[package]]
-name = "inotify-sys"
-version = "0.1.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e05c02b5e89bff3b946cedeca278abc628fe811e604f027c45a8aa3cf793d0eb"
-dependencies = [
- "libc",
-]
-
 [[package]]
 name = "inout"
 version = "0.1.4"
@@ -1285,6 +1251,15 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "jpeg-decoder"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "00810f1d8b74be64b13dbf3db89ac67740615d6c891f0e7b6179326533011a07"
+dependencies = [
+ "rayon",
+]
+
 [[package]]
 name = "js-sys"
 version = "0.3.91"
@@ -1295,26 +1270,6 @@ dependencies = [
  "wasm-bindgen",
 ]
 
-[[package]]
-name = "kqueue"
-version = "1.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "eac30106d7dce88daf4a3fcb4879ea939476d5074a9b7ddd0fb97fa4bed5596a"
-dependencies = [
- "kqueue-sys",
- "libc",
-]
-
-[[package]]
-name = "kqueue-sys"
-version = "1.0.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ed9625ffda8729b85e45cf04090035ac368927b8cebc34898e7c120f52e4838b"
-dependencies = [
- "bitflags 1.3.2",
- "libc",
-]
-
 [[package]]
 name = "lazy_static"
 version = "1.5.0"
@@ -1358,7 +1313,7 @@ version = "0.1.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1744e39d1d6a9948f4f388969627434e31128196de472883b39f148769bfe30a"
 dependencies = [
- "bitflags 2.11.0",
+ "bitflags",
  "libc",
  "plain",
  "redox_syscall 0.7.3",
@@ -1412,7 +1367,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f560f57dfb9142a02d673e137622fd515d4231e51feb8b4af28d92647d83f35b"
 dependencies = [
  "aes",
- "bitflags 2.11.0",
+ "bitflags",
  "cbc",
  "chrono",
  "ecb",
@@ -1522,7 +1477,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a69bcab0ad47271a0234d9422b131806bf3968021e5dc9328caf2d4cd58557fc"
 dependencies = [
  "libc",
- "log",
  "wasi",
  "windows-sys 0.61.2",
 ]
@@ -1563,33 +1517,6 @@ dependencies = [
  "nom",
 ]
 
-[[package]]
-name = "notify"
-version = "8.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4d3d07927151ff8575b7087f245456e549fea62edf0ec4e565a5ee50c8402bc3"
-dependencies = [
- "bitflags 2.11.0",
- "fsevent-sys",
- "inotify",
- "kqueue",
- "libc",
- "log",
- "mio",
- "notify-types",
- "walkdir",
- "windows-sys 0.60.2",
-]
-
-[[package]]
-name = "notify-types"
-version = "2.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "42b8cfee0e339a0337359f3c88165702ac6e600dc01c0cc9579a92d62b08477a"
-dependencies = [
- "bitflags 2.11.0",
-]
-
 [[package]]
 name = "nu-ansi-term"
 version = "0.50.3"
@@ -1728,7 +1655,7 @@ version = "0.8.37"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6553f6604a52b3203db7b4e9d51eb4dd193cf455af9e56d40cab6575b547b679"
 dependencies = [
- "bitflags 2.11.0",
+ "bitflags",
  "bytemuck",
  "bytes",
  "chrono",
@@ -1820,7 +1747,7 @@ version = "0.18.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "60769b8b31b2a9f263dae2776c37b1b28ae246943cf719eb6946a1db05128a61"
 dependencies = [
- "bitflags 2.11.0",
+ "bitflags",
  "crc32fast",
  "fdeflate",
  "flate2",
@@ -2088,7 +2015,7 @@ version = "0.5.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ed2bf2547551a7053d6fdfafda3f938979645c44812fbfcda098faae3f1a362d"
 dependencies = [
- "bitflags 2.11.0",
+ "bitflags",
 ]
 
 [[package]]
@@ -2097,7 +2024,7 @@ version = "0.7.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6ce70a74e890531977d37e532c34d45e9055d2409ed08ddba14529471ed0be16"
 dependencies = [
- "bitflags 2.11.0",
+ "bitflags",
 ]
 
 [[package]]
@@ -2579,7 +2506,7 @@ checksum = "aa003f0038df784eb8fecbbac13affe3da23b45194bd57dba231c8f48199c526"
 dependencies = [
  "atoi",
  "base64",
- "bitflags 2.11.0",
+ "bitflags",
  "byteorder",
  "bytes",
  "chrono",
@@ -2623,7 +2550,7 @@ checksum = "db58fcd5a53cf07c184b154801ff91347e4c30d17a3562a635ff028ad5deda46"
 dependencies = [
  "atoi",
  "base64",
- "bitflags 2.11.0",
+ "bitflags",
  "byteorder",
  "chrono",
  "crc",
@@ -2921,7 +2848,7 @@ version = "0.6.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d4e6559d53cc268e5031cd8429d05415bc4cb4aefc4aa5d6cc35fbf5b924a1f8"
 dependencies = [
- "bitflags 2.11.0",
+ "bitflags",
  "bytes",
  "futures-util",
  "http",
@@ -3076,7 +3003,7 @@ version = "0.5.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "92ec61343a630d2b50d13216dea5125e157d3fc180a7d3f447d22fe146b648fc"
 dependencies = [
- "bitflags 2.11.0",
+ "bitflags",
  "regex",
  "unrar_sys",
  "widestring",
@@ -3341,7 +3268,7 @@ version = "0.244.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "47b807c72e1bac69382b3a6fb3dbe8ea4c0ed87ff5629b8685ae6b9a611028fe"
 dependencies = [
- "bitflags 2.11.0",
+ "bitflags",
  "hashbrown 0.15.5",
  "indexmap",
  "semver",
@@ -3787,7 +3714,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9d66ea20e9553b30172b5e831994e35fbde2d165325bec84fc43dbf6f4eb9cb2"
 dependencies = [
  "anyhow",
- "bitflags 2.11.0",
+ "bitflags",
  "indexmap",
  "log",
  "serde",