Update dependencies and implement email service integration

- Refactor app and email modules to include email service
- Add tests for user sign-up and mock email service

Cargo.lock

@@ -166,7 +166,7 @@ dependencies = [
  "memchr",
  "serde",
  "serde_derive",
- "winnow 0.7.7",
+ "winnow 0.7.8",
 ]
 
 [[package]]
@@ -226,9 +226,9 @@ checksum = "ace50bade8e6234aa140d9a2f552bbee1db4d353f69b8217bc503490fc1a9f26"
 
 [[package]]
 name = "axum"
-version = "0.8.3"
+version = "0.8.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "de45108900e1f9b9242f7f2e254aa3e2c029c921c258fe9e6b4217eeebd54288"
+checksum = "021e862c184ae977658b36c4500f7feac3221ca5da43e3f25bd04ab6c79a29b5"
 dependencies = [
  "axum-core",
  "axum-macros",
@@ -1385,9 +1385,9 @@ dependencies = [
 
 [[package]]
 name = "hashbrown"
-version = "0.15.2"
+version = "0.15.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bf151400ff0baff5465007dd2f3e717f3fe502074ca563069ce3a6629d07b289"
+checksum = "84b26c544d002229e640969970a2e74021aadf6e2f96372b9c58eff97de08eb3"
 dependencies = [
  "allocator-api2",
  "equivalent",
@@ -1400,7 +1400,7 @@ version = "0.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7382cf6263419f2d8df38c55d7da83da5c18aef87fc7a7fc1fb1e344edfe14c1"
 dependencies = [
- "hashbrown 0.15.2",
+ "hashbrown 0.15.3",
 ]
 
 [[package]]
@@ -1744,7 +1744,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cea70ddb795996207ad57735b50c5982d8844f38ba9ee5f1aedcfb708a2aa11e"
 dependencies = [
  "equivalent",
- "hashbrown 0.15.2",
+ "hashbrown 0.15.3",
 ]
 
 [[package]]
@@ -2453,6 +2453,7 @@ dependencies = [
  "argon2",
  "askama",
  "async-compression",
+ "async-trait",
  "axum",
  "axum-extra",
  "axum-test",
@@ -2618,9 +2619,9 @@ checksum = "357703d41365b4b27c590e3ed91eabb1b663f07c4c084095e60cbed4362dff0d"
 
 [[package]]
 name = "rustix"
-version = "1.0.5"
+version = "1.0.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d97817398dd4bb2e6da002002db259209759911da105da92bec29ccb12cf58bf"
+checksum = "c71e83d6afe7ff64890ec6b71d6a69bb8a610ab78ce364b3352876bb4c801266"
 dependencies = [
  "bitflags 2.9.0",
  "errno",
@@ -2831,9 +2832,9 @@ dependencies = [
 
 [[package]]
 name = "sha2"
-version = "0.10.8"
+version = "0.10.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "793db75ad2bcafc3ffa7c68b215fee268f537982cd901d132f89c6343f3a3dc8"
+checksum = "a7507d819769d01a365ab707794a4084392c824f54a7a6a7862f8c3d0892b283"
 dependencies = [
  "cfg-if",
  "cpufeatures",
@@ -2973,7 +2974,7 @@ dependencies = [
  "futures-intrusive",
  "futures-io",
  "futures-util",
- "hashbrown 0.15.2",
+ "hashbrown 0.15.3",
  "hashlink",
  "indexmap",
  "log",
@@ -3241,9 +3242,9 @@ checksum = "0bf256ce5efdfa370213c1dabab5935a12e49f2c58d15e9eac2870d3b4f27263"
 
 [[package]]
 name = "synstructure"
-version = "0.13.1"
+version = "0.13.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c8af7666ab7b6390ab78131fb5b0fce11d6b7a6951602017c35fa82800708971"
+checksum = "728a70f3dbaf5bab7f0c4b1ac8d7ae5ea60a4b5549c8a5914361c99147a709d2"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -3884,9 +3885,9 @@ dependencies = [
 
 [[package]]
 name = "webpki-roots"
-version = "0.26.9"
+version = "0.26.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "29aad86cec885cafd03e8305fd727c418e970a521322c91688414d5b8efba16b"
+checksum = "37493cadf42a2a939ed404698ded7fb378bf301b5011f973361779a3a74f8c93"
 dependencies = [
  "rustls-pki-types",
 ]
@@ -4150,9 +4151,9 @@ dependencies = [
 
 [[package]]
 name = "winnow"
-version = "0.7.7"
+version = "0.7.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6cb8234a863ea0e8cd7284fcdd4f145233eb00fee02bbdd9861aec44e6477bc5"
+checksum = "9e27d6ad3dac991091e4d35de9ba2d2d00647c5d0fc26c5496dee55984ae111b"
 dependencies = [
  "memchr",
 ]