rebrand: rename VoiceBox to TalkBox throughout codebase

- All 'voicebox'/'Voicebox'/'VOICEBOX' strings replaced with 'talkbox'/'TalkBox'/'TALKBOX'
- Port changed from 17493 to 17494 (avoids conflict with upstream VoiceBox)
- MCP tool namespace: voicebox.* -> talkbox.*
- App bundle ID: sh.voicebox.app -> com.talkbox.app
- Binary names: voicebox-server -> talkbox-server, voicebox-mcp -> talkbox-mcp
- Docker user/group: voicebox -> talkbox
- Database: voicebox.db -> talkbox.db
- Env vars: VOICEBOX_* -> TALKBOX_*
- Asset files renamed: voicebox-logo.* -> talkbox-logo.*, etc.
- External binaries in tauri.conf.json updated to talkbox-server/talkbox-mcp

scripts/build-server.sh

@@ -6,7 +6,7 @@ set -e
 # Determine platform
 PLATFORM=$(rustc --print host-tuple 2>/dev/null || echo "unknown")
 
-echo "Building Voicebox sidecars for platform: $PLATFORM"
+echo "Building TalkBox sidecars for platform: $PLATFORM"
 
 # Build Python binary
 # Resolve PATH to absolute paths before changing directory
@@ -39,9 +39,9 @@ copy_sidecar() {
 }
 
 python build_binary.py
-copy_sidecar voicebox-server
+copy_sidecar talkbox-server
 
 python build_binary.py --shim
-copy_sidecar voicebox-mcp
+copy_sidecar talkbox-mcp
 
 echo "Build complete!"