feat(windows-host): finish HostConfig migration — resolve operator/dispatch knobs once (Goal-1 stage 2)

Migrate 31 genuinely-constant operator/dispatch env::var sites onto HostConfig, so the
capture/topology/encoder decision reads ONE owner instead of being recomputed at each call
site (the latent bug where capture and encode could disagree on the resolved backend, plan §2.4):
idd_push x7, no_wgc, capture_backend, render_adapter, encoder_pref (Linux open_video +
linux_zero_copy_is_vaapi), the Windows vdisplay-backend select, plus the plan-named
secure_dda/idd_depth/zerocopy/ten_bit and the multi-site perf x4 / compositor x5 /
video_source x3 / gamepad. Each HostConfig field's parser is byte-identical to the read it
replaced, so old==new by construction (the plan's "a flipped bool is a silent regression" guard).

Scope correction — the plan's "~64 sites / Linux XDG+compositor included / grep env::var -> 0"
was unsafe as written. Two classes are deliberately KEPT as live reads and documented in config.rs:

  * Runtime-mutated session vars. vdisplay::apply_session_env REWRITES the process env on every
    connect (the Bazzite Gaming<->Desktop follow): WAYLAND_DISPLAY, XDG_CURRENT_DESKTOP,
    XDG_RUNTIME_DIR, DBUS_SESSION_BUS_ADDRESS, and the derived PUNKTFUNK_INPUT_BACKEND,
    GAMESCOPE_SESSION/NODE, KWIN/MUTTER_VIRTUAL_PRIMARY, FORCE_SHM. Parsing these once would
    freeze them at startup and silently break session-following — they are NOT constant.
  * Single-use local tuning with no resolve-once benefit (and FEC_PCT even has two different
    semantics): FEC_PCT, VIDEO_DROP, VBV_FRAMES, SPLIT_ENCODE, PACE_BURST_KB, the dxgi timing
    knobs, the *_LIVE/test gates, plus path/dynamic reads (config-dir, PATH search,
    env-forward-to-child). PUNKTFUNK_ZEROCOPY is split on purpose: Windows presence-semantics
    moved to the field; Linux keeps its own truthy (1|true|yes|on) parser.

Verified: Linux cargo check + clippy (-D warnings) + fmt clean on the touched files. The
Windows-only edits are 1:1 substitutions; they get a real Windows compile on the box with Stage 3.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

crates/punktfunk-host/src/gamestream/stream.rs

@@ -102,7 +102,7 @@ fn run(
     // request and capture it (no scaling). Self-contained — deliberately NOT pooled in
     // `video_cap`, since a reconnect at a different resolution needs a freshly-sized output; the
     // output is released when this capturer drops at stream end (RAII via its keepalive).
-    if std::env::var("PUNKTFUNK_VIDEO_SOURCE").as_deref() == Ok("virtual") {
+    if crate::config::config().video_source.as_deref() == Some("virtual") {
         // The launched app picks the compositor (e.g. gamescope for game entries) and the
         // nested command.
         let compositor = app
@@ -147,7 +147,7 @@ fn run(
             tracing::info!("video source: reusing capturer");
             c
         }
-        None if std::env::var("PUNKTFUNK_VIDEO_SOURCE").is_ok_and(|v| v == "portal") => {
+        None if crate::config::config().video_source.as_deref() == Some("portal") => {
             tracing::info!("video source: portal desktop capture");
             capture::open_portal_monitor().context("open portal capturer")?
         }
@@ -358,7 +358,7 @@ fn stream_body(
 
     // Per-stage timing (PUNKTFUNK_PERF=1): max µs/stage per second + unique vs re-encoded frames,
     // to pinpoint stalls. `unique` counts genuinely-new captured frames (vs re-encoded holds).
-    let perf = std::env::var_os("PUNKTFUNK_PERF").is_some();
+    let perf = crate::config::config().perf;
     let (mut mx_cap, mut mx_enc, mut mx_pkt, mut mx_send, mut mx_pkts, mut uniq) =
         (0u128, 0u128, 0u128, 0u128, 0usize, 0u32);
     // Absolute next-frame deadline — the single pacing clock for the loop.