security: Fix 10 vulnerabilities, remove 12 dead code instances

Critical fixes:
- Remove hardcoded admin/admin123 credentials from UserManager
- Enable JWT signature verification (was disabled for debugging)
- Redact secrets from /dev/config endpoint (was exposing os.environ)
- Remove hardcoded SSH admin/admin credentials from hardware service
- Add channel validation to prevent command injection in router interface

Rust fixes:
- Replace partial_cmp().unwrap() with .unwrap_or(Equal) to prevent
  NaN panics in 6 locations across core, signal, nn, mat crates
- Replace .expect()/.unwrap() with safe fallbacks in utils, csi_receiver
- Replace SystemTime unwrap with unwrap_or_default

Dead code removed:
- Duplicate imports (CORSMiddleware, os, Path, ABC, subprocess)
- Unused AdaptiveRateLimit/RateLimitStorage/RedisRateLimitStorage (~110 lines)
- Unused _log_authentication_event method
- Unused Confidence::new_unchecked in Rust
- Fix bare except: clause to except Exception:

https://claude.ai/code/session_01Ki7pvEZtJDvqJkmyn6B714

rust-port/wifi-densepose-rs/crates/wifi-densepose-core/src/types.rs

@@ -172,16 +172,6 @@ impl Confidence {
 
     /// Creates a confidence value without validation (for internal use).
     ///
-    /// # Safety
-    ///
-    /// The caller must ensure the value is in [0.0, 1.0].
-    #[must_use]
-    #[allow(dead_code)]
-    pub(crate) fn new_unchecked(value: f32) -> Self {
-        debug_assert!((0.0..=1.0).contains(&value));
-        Self(value)
-    }
-
     /// Returns the raw confidence value.
     #[must_use]
     pub fn value(&self) -> f32 {
@@ -1009,7 +999,12 @@ impl PoseEstimate {
     pub fn highest_confidence_person(&self) -> Option<&PersonPose> {
         self.persons
             .iter()
-            .max_by(|a, b| a.confidence.value().partial_cmp(&b.confidence.value()).unwrap())
+            .max_by(|a, b| {
+                a.confidence
+                    .value()
+                    .partial_cmp(&b.confidence.value())
+                    .unwrap_or(std::cmp::Ordering::Equal)
+            })
     }
 }
 

rust-port/wifi-densepose-rs/crates/wifi-densepose-core/src/utils.rs

@@ -98,8 +98,11 @@ pub fn moving_average(data: &Array1<f64>, window_size: usize) -> Array1<f64> {
     let mut result = Array1::zeros(data.len());
     let half_window = window_size / 2;
 
-    // Safe unwrap: ndarray Array1 is always contiguous
-    let slice = data.as_slice().expect("Array1 should be contiguous");
+    // ndarray Array1 is always contiguous, but handle gracefully if not
+    let slice = match data.as_slice() {
+        Some(s) => s,
+        None => return data.clone(),
+    };
 
     for i in 0..data.len() {
         let start = i.saturating_sub(half_window);