Apply code-review fixes: identity/pagination, load races, TLS pin, leaks

Addresses a multi-agent code review (26 confirmed findings + a URLSession
leak) across correctness, concurrency, security, and cleanup:

- MongoDocument.id: deterministic fallback (was UUID() on every access) to stop
  SwiftUI List/ForEach identity churn; getAll pagination drives its cursor off
  the real _id via documentId, so a missing _id stops paging instead of looping
  on a fabricated cursor.
- View models: per-load generation guard (+ captured-tab guard on ONU detail)
  so a cancelled or overlapping load can't commit stale results or land data on
  the wrong tab.
- JSONValue.intValue: guard Int(d) against NaN/inf/out-of-range (crash).
- ServerTrustEvaluator: hash the real SubjectPublicKeyInfo (prepend the
  algorithm-specific ASN.1 SPKI header) so a standard openssl-captured
  public-key pin actually matches; unknown key types fail closed.
- AppEnvironment.configure: clear stale cookies + Keychain creds on host change.
- FirmwareFile.isCompatible: empty metadata no longer passes as compatible-for-all.
- APIClient: invalidate URLSession on deinit (per-configure/probe leak).
- Dashboard best-effort sections keep last-good on transient failure; unified
  optical thresholds; LoginView prefill-once; populatedBuckets unique ForEach id;
  Format rounding rollover; dead-code/docstring/dedup cleanups.

Verification pending on the Mac (no Swift toolchain on the Linux dev box).

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

ONURepository.swift

@@ -14,7 +14,7 @@ final class ONURepository {
 
     /// Fetch every ONU state, paging through with the `next` cursor.
     func allStates() async throws -> [ONUStateDoc] {
-        try await client.getAll(.onuStates, idOf: { $0.id })
+        try await client.getAll(.onuStates, idOf: { $0.documentId })
     }
 
     func configs(query: APIQuery = .empty) async throws -> [ONUConfigDoc] {
@@ -26,7 +26,7 @@ final class ONURepository {
     func nameMap() async throws -> [String: String] {
         var query = APIQuery()
         query.projection = ["ONU.Name": 1]
-        let configs: [ONUConfigDoc] = try await client.getAll(.onuConfigs, baseQuery: query, idOf: { $0.id })
+        let configs: [ONUConfigDoc] = try await client.getAll(.onuConfigs, baseQuery: query, idOf: { $0.documentId })
         return configs.reduce(into: [:]) { map, config in
             if let name = config.name, !name.isEmpty { map[config.id] = name }
         }