Agent loop state machine refactor, unified LLM interface, and UI improvements

- Rewrite agent loop as Planning→Executing(N)→Completed state machine with
  per-step context isolation to prevent token explosion
- Split tools and prompts by phase (planning vs execution)
- Add advance_step/save_memo tools for step transitions and cross-step memory
- Unify LLM interface: remove duplicate types, single chat_with_tools path
- Add UTF-8 safe truncation (truncate_str) to prevent panics on Chinese text
- Extract CreateForm component, add auto-scroll to execution log
- Add report generation with app access URL, non-blocking title generation
- Add timer system, file serving, app proxy, exec module
- Update Dockerfile with uv, deployment config

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Dockerfile

@@ -8,7 +8,10 @@ RUN npm run build
 
 # Stage 2: Runtime
 FROM alpine:3.21
-RUN apk add --no-cache ca-certificates
+RUN apk add --no-cache ca-certificates curl bash
+RUN curl -LsSf https://astral.sh/uv/install.sh | sh
+ENV PATH="/root/.local/bin:$PATH"
+RUN mkdir -p /app/data/workspaces
 WORKDIR /app
 COPY target/aarch64-unknown-linux-musl/release/tori .
 COPY --from=frontend /app/web/dist ./web/dist/