Rename app from oAI to Confab

"oAI" reads as easily confused with OpenAI, both visually and in
casual conversation. Renamed to "Confab" throughout: Xcode
target/scheme/bundle ID (com.oai.Confab), Info.plist and Help Book
identity, all user-facing UI text, internal Log subsystem and color
identifiers, localization catalogs (6 languages, including a proper
reworded/retranslated Intel-deprecation notice), Help Book HTML
content, and docs (README/DEVELOPMENT/PRIVACY/SECURITY).

Deliberately cosmetic-only: the on-disk data folder
(~/Library/Application Support/oAI/), database/backup filenames,
Keychain service identifiers, and EncryptionService's key-derivation
inputs are all left untouched so existing conversations, settings,
and stored API keys survive the update with zero migration and no
re-entering credentials. Verified live: a real signed build
successfully decrypted a stored API key and loaded an existing
conversation database after the bundle ID change.

Also includes a small already-completed, previously uncommitted
model-release-date feature (ModelInfo/OpenRouterModels/
OpenRouterProvider/ModelInfoView) that happened to share several
files with this rename.

Gitignored on this branch and updated on disk but not part of this
commit: CLAUDE.md, RELEASE_NOTES.md, and the build*.sh scripts.

oAI/Views/Main/ContentView.swift

@@ -1,17 +1,17 @@
 //
 //  ContentView.swift
-//  oAI
+//  Confab
 //
 //  Root navigation container — NavigationSplitView with collapsible sidebar
 //
 // SPDX-License-Identifier: PolyForm-Noncommercial-1.0.0
 // Copyright (C) 2026 Rune Olsen
 //
-// This file is part of oAI.
+// This file is part of Confab.
 //
-// oAI is licensed under the PolyForm Noncommercial License 1.0.0.
+// Confab is licensed under the PolyForm Noncommercial License 1.0.0.
 // You may use, study, modify, and share it for any noncommercial
-// purpose. Commercial use — including selling oAI or any part of
+// purpose. Commercial use — including selling Confab or any part of
 // it, standalone or bundled into another product or service —
 // requires a separate commercial license from the copyright holder.
 //
@@ -134,7 +134,7 @@ struct ContentView: View {
                 UserDefaults.standard.set(true, forKey: "hasShownIntelWarning")
             }
         } message: {
-            Text("oAI v2.4 is the last version to support Intel Macs and Rosetta. Starting with macOS 28, oAI will require Apple Silicon. Consider upgrading your Mac to continue receiving updates.")
+            Text("Confab (formerly oAI) v2.4 was the last version to support Intel Macs and Rosetta. Starting with macOS 28, Confab will require Apple Silicon. Consider upgrading your Mac to continue receiving updates.")
         }
         .alert("Software Update", isPresented: Binding(
             get: { updateService.manualCheckMessage != nil },