Add fullporner provider with xiaoshenke proxy

- Implement fullporner.com provider with search, pagination, categories, pornstars
- Add xiaoshenke.net proxy for Cloudflare-protected embed videos
- Proxy fetches signed URLs via FlareSolverr and streams video content
- Fix quality bitmask mapping (1=360p, 2=480p, 4=720p, 8=1080p)
- Support HEAD/GET/Range for video streaming

Co-Authored-By: Claude Code <noreply@anthropic.com>

Cargo.toml

@@ -46,6 +46,7 @@ cbc = { version = "0.1", features = ["alloc"] }
 hex = "0.4"
 chromiumoxide = { version = "0.7", features = ["tokio-runtime"] }
 playwright-rs = "0.17"
+http-body-util = "0.1.5"
 
 [lints.rust]
 warnings = "warn"
@@ -68,4 +69,4 @@ incremental = true
 opt-level = 3
 codegen-units = 16
 lto = false
-debug = 0
+debug = 0