deps: add feed-rs crate for RSS/Atom feed parsing

backend/Cargo.lock

@@ -67,6 +67,7 @@ dependencies = [
  "dotenvy",
  "ego-tree",
  "email_address",
+ "feed-rs",
  "futures",
  "hex",
  "http-body-util",
@@ -730,6 +731,23 @@ version = "2.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "37909eebbb50d72f9059c3b6d82c0463f2ff062c9e95845c43a6c9c0355411be"
 
+[[package]]
+name = "feed-rs"
+version = "2.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e4c0591d23efd0d595099af69a31863ac1823046b1b021e3b06ba3aae7e00991"
+dependencies = [
+ "chrono",
+ "mediatype",
+ "quick-xml",
+ "regex",
+ "serde",
+ "serde_json",
+ "siphasher",
+ "url",
+ "uuid",
+]
+
 [[package]]
 name = "find-msvc-tools"
 version = "0.1.9"
@@ -1555,6 +1573,15 @@ version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "490cc448043f947bae3cbee9c203358d62dbee0db12107a74be5c30ccfd09771"
 
+[[package]]
+name = "mediatype"
+version = "0.19.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "33746aadcb41349ec291e7f2f0a3aa6834d1d7c58066fb4b01f68efc4c4b7631"
+dependencies = [
+ "serde",
+]
+
 [[package]]
 name = "memchr"
 version = "2.8.0"
@@ -2003,6 +2030,16 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "quick-xml"
+version = "0.37.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "331e97a1af0bf59823e6eadffe373d7b27f485be8748f71471c662c1f269b7fb"
+dependencies = [
+ "encoding_rs",
+ "memchr",
+]
+
 [[package]]
 name = "quote"
 version = "1.0.45"
@@ -3200,6 +3237,7 @@ dependencies = [
  "idna",
  "percent-encoding",
  "serde",
+ "serde_derive",
 ]
 
 [[package]]

backend/Cargo.toml

@@ -55,6 +55,9 @@ clap = { version = "4", features = ["derive"] }
 scraper = "0.22"
 ego-tree = "0.10"
 
+# RSS/Atom feed parsing
+feed-rs = "2"
+
 # URL parsing (scraper SSRF checks)
 url = "2"