V1.0: Class 1 fax — real-world 4-page send to external number confirmed

Core features:
- Class 1 T.30 protocol: full send/receive implementation
- HDLC: DLE-stuffing, FCS strip, USR5637 bit-reversal handling
- T.4 MH encoder/decoder (1728px A4 standard)
- Document pipeline: PDF (Ghostscript), PNG, TIFF input
- Width clamping: US Letter 1734px → 1728px fax standard
- Cover page: CJK rasterization (TW/CN/JP/EN), TIFF + HTML output
- OCR verification: Tesseract 5 with eng+chi_tra, CJK space-tolerant
- API server (axum): health, send, jobs, cover, retry, cancel
- Background worker: auto-poll queue, speed fallback, retry policy
- Modem detection, pool management

Real-world test results (2026-07-23):
- V90 → 25153038: 4 pages, V.17 12000 bps, 2:33 ✅
- USR5637 → 25153038: 4 pages, V.17 12000 bps, 2:26 ✅
- Both faxes confirmed received on remote machine

Tested: loopback (100% pixel match), multi-page, all input formats,
cover pages, OCR verify, API endpoints, worker processing.
13 unit tests pass, 0 new clippy warnings.

Cargo.toml

@@ -7,7 +7,7 @@ license = "MIT"
 
 [features]
 default = ["server"]
-server = ["dep:axum", "dep:clap", "dep:tokio", "dep:rusqlite", "dep:tower-http", "dep:tracing-subscriber"]
+server = ["dep:axum", "dep:clap", "dep:tokio", "dep:rusqlite", "dep:tower-http", "dep:tracing-subscriber", "dep:lettre"]
 cli = ["dep:clap"]
 
 [lib]
@@ -29,6 +29,8 @@ fax = "0.2"
 image = "0.25"
 tiff = "0.11"
 lopdf = "0.36"
+imageproc = "0.24"
+rusttype = "0.9"
 
 # Error handling
 thiserror = "2"
@@ -62,3 +64,15 @@ chrono = { version = "0.4", features = ["serde"] }
 
 # Config file parsing
 toml = "0.8"
+
+# Archive support
+zip = "2.2"
+tar = "0.4"
+flate2 = "1.0"
+unrar = { version = "0.1", optional = true }
+sevenz-rust = { version = "0.6", optional = true }
+
+# Email support (for Email-to-Fax and notifications)
+lettre = { version = "0.11", features = ["tokio1-native-tls"], optional = true }
+regex = "1"
+rand = "0.8"