feat: add S3 authentication and fix Docker multi-segment routes

S3 Storage:
- Implement AWS Signature v4 for S3-compatible storage (MinIO, AWS)
- Add s3_access_key, s3_secret_key, s3_region config options
- Support both authenticated and anonymous S3 access
- Add proper URI encoding for S3 canonical requests

Docker Registry:
- Fix routing for multi-segment image names (e.g., library/alpine)
- Add namespace routes for two-segment paths (/v2/{ns}/{name}/...)
- Add debug tracing for upstream proxy operations

Config:
- Add NORA_STORAGE_S3_ACCESS_KEY env var
- Add NORA_STORAGE_S3_SECRET_KEY env var
- Add NORA_STORAGE_S3_REGION env var (default: us-east-1)

Cargo.lock

@@ -240,9 +240,9 @@ checksum = "b35204fbdc0b3f4446b89fc1ac2cf84a8a68971995d0bf2e925ec7cd960f9cb3"
 
 [[package]]
 name = "cc"
-version = "1.2.54"
+version = "1.2.55"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6354c81bbfd62d9cfa9cb3c773c2b7b2a3a482d569de977fd0e961f6e7c00583"
+checksum = "47b26a0954ae34af09b50f0de26458fa95369a0d478d8236d3f93082b219bd29"
 dependencies = [
  "find-msvc-tools",
  "shlex",
@@ -286,9 +286,9 @@ dependencies = [
 
 [[package]]
 name = "clap"
-version = "4.5.54"
+version = "4.5.56"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c6e6ff9dcd79cff5cd969a17a545d79e84ab086e444102a591e288a8aa3ce394"
+checksum = "a75ca66430e33a14957acc24c5077b503e7d374151b2b4b3a10c83b4ceb4be0e"
 dependencies = [
  "clap_builder",
  "clap_derive",
@@ -296,9 +296,9 @@ dependencies = [
 
 [[package]]
 name = "clap_builder"
-version = "4.5.54"
+version = "4.5.56"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fa42cf4d2b7a41bc8f663a7cab4031ebafa1bf3875705bfaf8466dc60ab52c00"
+checksum = "793207c7fa6300a0608d1080b858e5fdbe713cdc1c8db9fb17777d8a13e63df0"
 dependencies = [
  "anstream",
  "anstyle",
@@ -308,9 +308,9 @@ dependencies = [
 
 [[package]]
 name = "clap_derive"
-version = "4.5.49"
+version = "4.5.55"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2a0b5487afeab2deb2ff4e03a807ad1a03ac532ff5a2cee5d86884440c7f7671"
+checksum = "a92793da1a46a5f2a02a6f4c46c6496b28c43638adea8306fcb0caa1634f24e5"
 dependencies = [
  "heck",
  "proc-macro2",
@@ -434,6 +434,7 @@ checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
 dependencies = [
  "block-buffer",
  "crypto-common",
+ "subtle",
 ]
 
 [[package]]
@@ -488,9 +489,9 @@ dependencies = [
 
 [[package]]
 name = "find-msvc-tools"
-version = "0.1.8"
+version = "0.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8591b0bcc8a98a64310a2fae1bb3e9b8564dd10e381e6e28010fde8e8e8568db"
+checksum = "5baebc0774151f905a1a2cc41989300b1e6fbb29aff0ceffa1064fdd3088d582"
 
 [[package]]
 name = "flate2"
@@ -737,6 +738,21 @@ version = "0.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fc0fef456e4baa96da950455cd02c081ca953b141298e41db3fc7e36b1da849c"
 
+[[package]]
+name = "hex"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7f24254aa9a54b5c858eaee2f5bccdb46aaf0e486a595ed5fd8f86ba55232a70"
+
+[[package]]
+name = "hmac"
+version = "0.12.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6c49c37c09c17a53d937dfbb742eb3a961d65a994e6bcdcf37e7399d0cc8ab5e"
+dependencies = [
+ "digest",
+]
+
 [[package]]
 name = "http"
 version = "1.4.0"
@@ -861,9 +877,9 @@ dependencies = [
 
 [[package]]
 name = "iana-time-zone"
-version = "0.1.64"
+version = "0.1.65"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "33e57f83510bb73707521ebaffa789ec8caf86f9657cad665b092b581d40e9fb"
+checksum = "e31bc9ad994ba00e440a8aa5c9ef0ec67d5cb5e5cb0cc7f8b744a35b389cc470"
 dependencies = [
  "android_system_properties",
  "core-foundation-sys",
@@ -1209,6 +1225,8 @@ dependencies = [
  "clap",
  "flate2",
  "governor",
+ "hex",
+ "hmac",
  "httpdate",
  "indicatif",
  "lazy_static",
@@ -2162,9 +2180,9 @@ checksum = "5d99f8c9a7727884afe522e9bd5edbfc91a3312b36a77b5fb8926e4c31a41801"
 
 [[package]]
 name = "tonic"
-version = "0.14.2"
+version = "0.14.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "eb7613188ce9f7df5bfe185db26c5814347d110db17920415cf2fbcad85e7203"
+checksum = "a286e33f82f8a1ee2df63f4fa35c0becf4a85a0cb03091a15fd7bf0b402dc94a"
 dependencies = [
  "async-trait",
  "axum",
@@ -2912,18 +2930,18 @@ dependencies = [
 
 [[package]]
 name = "zerocopy"
-version = "0.8.33"
+version = "0.8.37"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "668f5168d10b9ee831de31933dc111a459c97ec93225beb307aed970d1372dfd"
+checksum = "7456cf00f0685ad319c5b1693f291a650eaf345e941d082fc4e03df8a03996ac"
 dependencies = [
  "zerocopy-derive",
 ]
 
 [[package]]
 name = "zerocopy-derive"
-version = "0.8.33"
+version = "0.8.37"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2c7962b26b0a8685668b671ee4b54d007a67d4eaf05fda79ac0ecf41e32270f1"
+checksum = "1328722bbf2115db7e19d69ebcc15e795719e2d66b60827c6a69a117365e37a0"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -3026,9 +3044,9 @@ checksum = "40990edd51aae2c2b6907af74ffb635029d5788228222c4bb811e9351c0caad3"
 
 [[package]]
 name = "zmij"
-version = "1.0.16"
+version = "1.0.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dfcd145825aace48cff44a8844de64bf75feec3080e0aa5cdbde72961ae51a65"
+checksum = "02aae0f83f69aafc94776e879363e9771d7ecbffe2c7fbb6c14c5e00dfe88439"
 
 [[package]]
 name = "zopfli"