feat: add email settings management

- Introduced EmailSettings component for managing SMTP services.
- Added API endpoints for organization email services including CRUD operations.
- Created database migrations for organization_email_settings and organization_email_services tables.
- Updated the settings page to include EmailSettings component.
- Implemented validation and error handling for email service operations.

Cargo.lock

@@ -49,6 +49,17 @@ version = "1.0.100"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a23eb6b1614318a8071c9b2521f36b424b2c83db5eb3a0fead4a6c0809af6e61"
 
+[[package]]
+name = "async-trait"
+version = "0.1.89"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9035ad2d096bed7955a320ee7e2230574d28fd3c3a0f186cbea1ff3c7eed5dbb"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "atoi"
 version = "2.0.0"
@@ -1244,6 +1255,22 @@ dependencies = [
  "zeroize",
 ]
 
+[[package]]
+name = "email-encoding"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9298e6504d9b9e780ed3f7dfd43a61be8cd0e09eb07f7706a945b0072b6670b6"
+dependencies = [
+ "base64 0.22.1",
+ "memchr",
+]
+
+[[package]]
+name = "email_address"
+version = "0.2.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e079f19b08ca6239f47f8ba8509c11cf3ea30095831f7fed61441475edd8c449"
+
 [[package]]
 name = "encoding_rs"
 version = "0.8.35"
@@ -2111,6 +2138,32 @@ dependencies = [
  "spin",
 ]
 
+[[package]]
+name = "lettre"
+version = "0.11.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dabda5859ee7c06b995b9d1165aa52c39110e079ef609db97178d86aeb051fa7"
+dependencies = [
+ "async-trait",
+ "base64 0.22.1",
+ "email-encoding",
+ "email_address",
+ "fastrand",
+ "futures-io",
+ "futures-util",
+ "httpdate",
+ "idna",
+ "mime",
+ "native-tls",
+ "nom",
+ "percent-encoding",
+ "quoted_printable",
+ "socket2 0.6.1",
+ "tokio",
+ "tokio-native-tls",
+ "url",
+]
+
 [[package]]
 name = "libc"
 version = "0.2.178"
@@ -2170,6 +2223,7 @@ dependencies = [
  "dotenvy",
  "http 1.4.0",
  "jsonwebtoken",
+ "lettre",
  "mime_guess",
  "reqwest 0.12.26",
  "serde",
@@ -2319,6 +2373,15 @@ version = "0.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b93853da6d84c2e3c7d730d6473e8817692dd89be387eb01b94d7f108ecb5b8c"
 
+[[package]]
+name = "nom"
+version = "8.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "df9761775871bdef83bee530e60050f7e54b1105350d6884eb0fb4f46c2f9405"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "nonempty"
 version = "0.7.0"
@@ -2778,6 +2841,12 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "quoted_printable"
+version = "0.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "478e0585659a122aa407eb7e3c0e1fa51b1d8a870038bd29f0cf4a8551eea972"
+
 [[package]]
 name = "r-efi"
 version = "5.3.0"