Drop unused Phase-1 scaffolding: page, metainfo, service

These three modules were ported from NewPipeExtractor in Phase 1 as
part of the spine. Nothing in the YT extractor (channel/search/stream/
playlist/linkhandler) imports them, and the strawcore wrapper crate
that consumes us doesn't re-export them either. Per the round-2
audit's cruft inventory, this is ~195 LOC of dead surface shipping
to every Android APK.

  * page.rs — Page continuation carrier; continuation tokens flow
    through the codebase as plain Strings.
  * metainfo.rs — NPE MetaInfo info-card struct; no extractor
    populates it.
  * service.rs — StreamingService trait + ServiceInfo + LinkType;
    zero impls exist anywhere.

Wrapper does not need to change — none of the pub use re-exports
crossed the crate boundary.

src/lib.rs

@@ -1,18 +1,14 @@
 // Rust port of NewPipeExtractor (YT-only).
 //
-// Phase 1 lays the dependency-free spine that everything else builds on:
-// errors, localization, the Downloader contract, value types, the
-// StreamingService trait, and the NewPipe singleton. None of this module
-// tree knows anything about YouTube yet — that lands in Phase 3+.
+// The spine ports the core NPE contract — errors, localization, the
+// Downloader trait, value types, the NewPipe singleton — and then the
+// YT-specific extractors live under `youtube/`.
 
 pub mod downloader;
 pub mod exceptions;
 pub mod image;
 pub mod localization;
-pub mod metainfo;
 pub mod newpipe;
-pub mod page;
-pub mod service;
 pub mod stream;
 pub mod youtube;
 
@@ -20,7 +16,4 @@ pub use downloader::{Downloader, Request, Response};
 pub use exceptions::{ExtractionError, NetworkError, ParsingError};
 pub use image::{Image, ImageSet, ResolutionLevel};
 pub use localization::{ContentCountry, Localization};
-pub use metainfo::MetaInfo;
 pub use newpipe::NewPipe;
-pub use page::Page;
-pub use service::{LinkType, ServiceInfo, StreamingService};

src/metainfo.rs

@@ -1,53 +0,0 @@
-// MetaInfo — mirrors NPE MetaInfo.java.
-//
-// Carries "info card" style data (knowledge-panel boxes, COVID/election
-// warning banners, etc.) attached to a stream or search result. Paired URLs
-// + URL texts — same indices.
-
-use url::Url;
-
-#[derive(Clone, Debug, Default)]
-pub struct MetaInfo {
-    title: String,
-    content: String,
-    urls: Vec<Url>,
-    url_texts: Vec<String>,
-}
-
-impl MetaInfo {
-    pub fn new() -> Self {
-        Self::default()
-    }
-
-    pub fn title(&self) -> &str {
-        &self.title
-    }
-
-    pub fn set_title(&mut self, title: impl Into<String>) -> &mut Self {
-        self.title = title.into();
-        self
-    }
-
-    pub fn content(&self) -> &str {
-        &self.content
-    }
-
-    pub fn set_content(&mut self, content: impl Into<String>) -> &mut Self {
-        self.content = content.into();
-        self
-    }
-
-    pub fn urls(&self) -> &[Url] {
-        &self.urls
-    }
-
-    pub fn url_texts(&self) -> &[String] {
-        &self.url_texts
-    }
-
-    pub fn add_url(&mut self, url: Url, text: impl Into<String>) -> &mut Self {
-        self.urls.push(url);
-        self.url_texts.push(text.into());
-        self
-    }
-}

src/page.rs

@@ -1,79 +0,0 @@
-// Page — continuation token carrier. Mirrors NPE Page.java.
-//
-// Used everywhere "the next page" is paginated through an opaque token
-// (search results, channel videos, playlist videos, comments). The fields
-// are deliberately a grab-bag — NPE callers stuff whatever they need to
-// resume.
-
-use std::collections::BTreeMap;
-
-#[derive(Clone, Debug, Default)]
-pub struct Page {
-    url: Option<String>,
-    id: Option<String>,
-    ids: Vec<String>,
-    body: Option<Vec<u8>>,
-    cookies: BTreeMap<String, String>,
-}
-
-impl Page {
-    pub fn new() -> Self {
-        Self::default()
-    }
-
-    pub fn with_url(url: impl Into<String>) -> Self {
-        Self { url: Some(url.into()), ..Self::default() }
-    }
-
-    pub fn url(&self) -> Option<&str> {
-        self.url.as_deref()
-    }
-
-    pub fn set_url(&mut self, url: Option<String>) -> &mut Self {
-        self.url = url;
-        self
-    }
-
-    pub fn id(&self) -> Option<&str> {
-        self.id.as_deref()
-    }
-
-    pub fn set_id(&mut self, id: Option<String>) -> &mut Self {
-        self.id = id;
-        self
-    }
-
-    pub fn ids(&self) -> &[String] {
-        &self.ids
-    }
-
-    pub fn set_ids(&mut self, ids: Vec<String>) -> &mut Self {
-        self.ids = ids;
-        self
-    }
-
-    pub fn body(&self) -> Option<&[u8]> {
-        self.body.as_deref()
-    }
-
-    pub fn set_body(&mut self, body: Option<Vec<u8>>) -> &mut Self {
-        self.body = body;
-        self
-    }
-
-    pub fn cookies(&self) -> &BTreeMap<String, String> {
-        &self.cookies
-    }
-
-    pub fn set_cookies(&mut self, cookies: BTreeMap<String, String>) -> &mut Self {
-        self.cookies = cookies;
-        self
-    }
-
-    pub fn is_valid(&self) -> bool {
-        self.url.as_deref().map(|s| !s.is_empty()).unwrap_or(false)
-            || self.id.as_deref().map(|s| !s.is_empty()).unwrap_or(false)
-            || !self.ids.is_empty()
-            || self.body.as_ref().map(|b| !b.is_empty()).unwrap_or(false)
-    }
-}

src/service.rs

@@ -1,63 +0,0 @@
-// StreamingService trait + ServiceInfo + LinkType. Mirrors NPE
-// StreamingService.java.
-//
-// Phase 1 keeps this dependency-free — no extractor traits, no per-service
-// linkHandler factories. YouTube's concrete impl lands in Phase 3 once the
-// JS engine is in place (Phase 2).
-//
-// Service IDs are stable persistence keys per SPEC §3 invariant #6:
-// YouTube = 0, even if we never implement another service.
-
-use std::fmt;
-
-#[derive(Clone, Copy, Debug, Eq, PartialEq, Hash)]
-pub enum LinkType {
-    None,
-    Stream,
-    Channel,
-    Playlist,
-}
-
-#[derive(Clone, Copy, Debug, Eq, PartialEq, Hash)]
-pub enum MediaCapability {
-    Audio,
-    Video,
-    LiveStream,
-    Comments,
-}
-
-#[derive(Clone, Debug)]
-pub struct ServiceInfo {
-    name: String,
-    media_capabilities: Vec<MediaCapability>,
-}
-
-impl ServiceInfo {
-    pub fn new(name: impl Into<String>, media_capabilities: Vec<MediaCapability>) -> Self {
-        Self { name: name.into(), media_capabilities }
-    }
-
-    pub fn name(&self) -> &str {
-        &self.name
-    }
-
-    pub fn media_capabilities(&self) -> &[MediaCapability] {
-        &self.media_capabilities
-    }
-}
-
-pub trait StreamingService: Send + Sync {
-    fn service_id(&self) -> u32;
-    fn service_info(&self) -> &ServiceInfo;
-
-    fn base_url(&self) -> &str;
-}
-
-impl fmt::Debug for dyn StreamingService {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.debug_struct("StreamingService")
-            .field("service_id", &self.service_id())
-            .field("name", &self.service_info().name())
-            .finish()
-    }
-}