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/oAIApp.swift

@@ -1,17 +1,17 @@
 //
 //  oAIApp.swift
-//  oAI
+//  Confab
 //
 //  Main app entry point
 //
 // 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.
 //
@@ -117,7 +117,7 @@ struct oAIApp: App {
         .commands {
             // ── Apple menu ────────────────────────────────────────────────
             CommandGroup(replacing: .appInfo) {
-                Button("About oAI") { showAbout = true }
+                Button("About Confab") { showAbout = true }
             }
 
             CommandGroup(replacing: .appSettings) {
@@ -206,7 +206,7 @@ struct oAIApp: App {
 
             // ── Help menu ─────────────────────────────────────────────────
             CommandGroup(replacing: .help) {
-                Button("oAI Help") { openHelp() }
+                Button("Confab Help") { openHelp() }
                     .keyboardShortcut("?", modifiers: .command)
                 Divider()
                 Button(UpdateCheckService.shared.isCheckingManually ? "Checking…" : "Check for Updates…") {
@@ -224,7 +224,7 @@ struct oAIApp: App {
         // through NSHelpManager/Help Viewer — see CLAUDE.md's macOS 27 beta note for why
         // (Apple's Tips.app replacement for Help Viewer can't resolve anchors on this beta).
         // Revisit once macOS 27 reaches RC.
-        if let helpBookURL = Bundle.main.url(forResource: "oAI.help", withExtension: nil) {
+        if let helpBookURL = Bundle.main.url(forResource: "Confab.help", withExtension: nil) {
             NSWorkspace.shared.open(helpBookURL.appendingPathComponent("Contents/Resources/en.lproj/index.html"))
         }
     }