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

Dockerfile

@@ -1,5 +1,5 @@
 # ============================================================
-# Voicebox — Local TTS Server with Web UI
+# TalkBox — Local TTS Server with Web UI
 # 3-stage build: Frontend → Python deps → Runtime
 #
 # Build variants:
@@ -71,8 +71,8 @@ RUN pip install --no-cache-dir --prefix=/install \
 FROM python:3.11-slim
 
 # Create non-root user; the entrypoint joins GPU device groups at runtime.
-RUN groupadd -r voicebox && \
-    useradd -r -g voicebox -m -s /bin/bash voicebox
+RUN groupadd -r talkbox && \
+    useradd -r -g talkbox -m -s /bin/bash talkbox
 
 WORKDIR /app
 
@@ -87,27 +87,27 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
 COPY --from=backend-builder /install /usr/local
 
 # Copy backend application code
-COPY --chown=voicebox:voicebox backend/ /app/backend/
+COPY --chown=talkbox:talkbox backend/ /app/backend/
 
 # Copy built frontend from frontend stage
-COPY --from=frontend --chown=voicebox:voicebox /build/web/dist /app/frontend/
+COPY --from=frontend --chown=talkbox:talkbox /build/web/dist /app/frontend/
 
 # Create data directories owned by non-root user
 RUN mkdir -p /app/data/generations /app/data/profiles /app/data/cache \
-    && chown -R voicebox:voicebox /app/data
+    && chown -R talkbox:talkbox /app/data
 
 # Expose the API port
-EXPOSE 17493
+EXPOSE 17494
 
 # Health check — auto-restart if the server hangs
 HEALTHCHECK --interval=30s --timeout=10s --retries=3 --start-period=60s \
-    CMD curl -f http://localhost:17493/health || exit 1
+    CMD curl -f http://localhost:17494/health || exit 1
 
-# Entrypoint joins GPU groups then drops to the voicebox user.
+# Entrypoint joins GPU groups then drops to the talkbox user.
 # Normalize CRLF (a Windows checkout otherwise leaves the shebang as
 # `#!/bin/sh\r`, which Linux can't resolve — reported as a misleading
 # "no such file or directory" even though the file exists).
 COPY --chmod=755 scripts/rocm-entrypoint.sh /usr/local/bin/entrypoint.sh
 RUN sed -i 's/\r$//' /usr/local/bin/entrypoint.sh
 ENTRYPOINT ["/usr/local/bin/entrypoint.sh"]
-CMD ["uvicorn", "backend.main:app", "--host", "0.0.0.0", "--port", "17493"]
+CMD ["uvicorn", "backend.main:app", "--host", "0.0.0.0", "--port", "17494"]