feat: service console auto-connect, settings panel, and batch of enhancements

- Auto-connect WebSocket on page load in service console
- Settings modal for editing sgclaw_config.json (API key, base URL, model, skills dir, etc.)
- UpdateConfig/ConfigUpdated protocol messages for remote config save
- save_to_path() for SgClawSettings serialization
- ConfigUpdated handler in sg_claw_client binary
- Protocol serialization tests for new message types
- HTML test assertions for auto-connect and settings UI
- Additional pending changes: deterministic submit, org units, lineloss xlsx export, browser script tool, and docs

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docs/superpowers/specs/2026-04-13-rust-side-lineloss-xlsx-export.md

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+# Rust-Side Lineloss XLSX Export
+
+## Problem
+
+`collect_lineloss.js` runs on a remote page (`http://20.76.57.61:18080/gsllys`).
+The script successfully queries API data (12 rows), but cannot call
+`http://localhost:13313/.../faultDetailsExportXLSX` because the browser blocks
+cross-origin requests from a remote page to `localhost`.
+
+The original scene architecture had a local scene page acting as a proxy,
+but skill mode has no local page -- so export is architecturally impossible
+from the browser side.
+
+## Decision
+
+Move XLSX generation to the Rust side. JS only collects data; Rust generates
+the `.xlsx` file locally after receiving the artifact.
+
+Report log (`setReportLog`) is deferred to a later iteration.
+
+## Design
+
+### JS Changes (`collect_lineloss.js`)
+
+1. Remove `exportWorkbook()` call and `writeReportLog()` call
+2. Return artifact with `rows` array and `column_defs` array
+3. Status is `ok` when rows > 0, `empty` when rows == 0, `error`/`blocked` unchanged
+
+Artifact shape:
+```json
+{
+  "type": "report-artifact",
+  "report_name": "tq-lineloss-report",
+  "status": "ok",
+  "org": { "label": "...", "code": "..." },
+  "period": { "mode": "month", "value": "2026-03" },
+  "column_defs": [["ORG_NAME","供电单位"], ["YGDL","累计供电量"], ...],
+  "rows": [
+    {"ORG_NAME":"xxx", "YGDL":"12345.67", ...}
+  ],
+  "counts": { "rows": 12 }
+}
+```
+
+### Rust Changes
+
+#### New file: `src/compat/lineloss_xlsx_export.rs`
+
+Generates a standard `.xlsx` file using `zip` crate + OpenXML XML strings.
+Follows the pattern established in `openxml_office_tool.rs`.
+
+Public API:
+```rust
+pub struct LinelossExportRequest {
+    pub column_defs: Vec<(String, String)>,  // (key, chinese_header)
+    pub rows: Vec<Map<String, Value>>,
+    pub sheet_name: String,
+    pub output_path: PathBuf,
+}
+
+pub fn export_lineloss_xlsx(request: &LinelossExportRequest) -> anyhow::Result<PathBuf>;
+```
+
+Internals:
+- Build header row from `column_defs[*].1` (chinese names)
+- Build data rows by looking up `column_defs[*].0` keys in each row map
+- Generate `worksheet_xml` with inline string cells
+- Package with standard OpenXML boilerplate (content_types, rels, workbook)
+- Write to `output_path`
+
+#### Modified: `src/compat/deterministic_submit.rs`
+
+In `execute_deterministic_submit_with_browser_backend` (and the non-backend variant):
+
+```
+let output = execute_browser_script_skill_raw_output_with_browser_backend(...)?;
+let artifact = parse_lineloss_artifact(&output);
+
+if artifact has rows > 0 && column_defs present:
+    let export_path = workspace_root/out/tq-lineloss-{timestamp}.xlsx
+    export_lineloss_xlsx(LinelossExportRequest { ... })?
+    // attach export_path to outcome summary
+
+Ok(summarize_lineloss_output_with_export(&output, export_path))
+```
+
+#### Modified: `src/compat/mod.rs`
+
+Add `pub mod lineloss_xlsx_export;`
+
+### Output Path
+
+`{workspace_root}/out/tq-lineloss-{org_label}-{period}-{timestamp_nanos}.xlsx`
+
+### Error Handling
+
+- XLSX generation failure: outcome status = `partial`, reason = `xlsx_export_failed`
+- Artifact parse failure: fall through to existing `summarize_lineloss_output`
+
+## Files Changed
+
+| File | Change Type |
+|------|-------------|
+| `collect_lineloss.js` | Modify: remove export/log calls, add rows+column_defs to artifact |
+| `src/compat/lineloss_xlsx_export.rs` | New: XLSX generation |
+| `src/compat/deterministic_submit.rs` | Modify: post-process artifact, call XLSX export |
+| `src/compat/mod.rs` | Modify: register new module |
+
+## Requires Recompilation
+
+Yes. Rust code changes require `cargo build`.