feat: import Trading Economics HTML calendar — 993 events with forecasts

Adds a one-click upload+parse flow for the TE calendar page HTML.
The TE page (tradingeconomics.com/calendar) contains ~1000 events with
actuals, previous, and analyst consensus (forecast) values.

- Add backend/services/te_html_parser.py:
  - parse_html(html): extracts events from <tr data-event> rows
  - Maps 14 countries to major currencies (all Eurozone → EUR)
  - Impact inferred from data-category (high/medium/low)
  - Times converted from Europe/Zurich (CET/CEST) → UTC via zoneinfo
  - Actual=td[5], Forecast=td[7] (analyst consensus), Previous=td[6]
- Add POST /api/eco/te-html-upload (saves file to /tmp)
- Add POST /api/eco/te-html-import + GET /status (background parse)
- Add "Import TE HTML" upload button in CalendarPage ImportPanel

Tested locally: 993 events parsed, 854 with forecast, 861 with actual,
date range 2025-03-31 → 2026-06-17, timezone conversion verified.

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

backend/routers/eco.py

@@ -293,11 +293,27 @@ def upcoming_events() -> List[Dict[str, Any]]:
 
 # ── Forex Factory calendar ────────────────────────────────────────────────────
 
-_ff_import_status:  Dict[str, Any] = {"running": False, "last_result": None}
-_ff_sync_status:    Dict[str, Any] = {"running": False, "last_result": None}
-_ff_scrape_status:  Dict[str, Any] = {"running": False, "last_result": None}
-_te_sync_status:    Dict[str, Any] = {"running": False, "last_result": None}
-_fxs_sync_status:   Dict[str, Any] = {"running": False, "last_result": None}
+_ff_import_status:   Dict[str, Any] = {"running": False, "last_result": None}
+_ff_sync_status:     Dict[str, Any] = {"running": False, "last_result": None}
+_ff_scrape_status:   Dict[str, Any] = {"running": False, "last_result": None}
+_te_sync_status:     Dict[str, Any] = {"running": False, "last_result": None}
+_fxs_sync_status:    Dict[str, Any] = {"running": False, "last_result": None}
+_te_html_status:     Dict[str, Any] = {"running": False, "last_result": None}
+
+_TE_HTML_CANDIDATES = [
+    "/app/calendar_data.txt",
+    "/tmp/calendar_data.txt",
+    os.path.join(os.path.dirname(__file__), "..", "..", "calendar_data.txt"),
+    os.path.join(os.path.dirname(__file__), "..", "calendar_data.txt"),
+]
+
+
+def _find_te_html() -> str | None:
+    for p in _TE_HTML_CANDIDATES:
+        full = os.path.abspath(p)
+        if os.path.exists(full):
+            return full
+    return None
 
 # CSV search order: Docker image (/app), uploaded to /tmp, local dev paths
 _FF_CSV_CANDIDATES = [
@@ -470,6 +486,57 @@ def fmp_sync_status_ep() -> Dict[str, Any]:
     return _te_sync_status
 
 
+# ── Trading Economics HTML import ─────────────────────────────────────────────
+
+@router.post("/te-html-upload")
+async def te_html_upload(file: UploadFile = File(...)) -> Dict[str, Any]:
+    """Upload calendar_data.txt (TE HTML page) from the browser."""
+    dest = "/tmp/calendar_data.txt"
+    try:
+        content = await file.read()
+        with open(dest, "wb") as f:
+            f.write(content)
+        size_mb = round(len(content) / 1_048_576, 1)
+        print(f"[TE HTML upload] Saved {size_mb} MB to {dest}", flush=True)
+        return {"status": "uploaded", "path": dest, "size_mb": size_mb}
+    except Exception as e:
+        raise HTTPException(500, f"Upload failed: {e}")
+
+
+def _run_te_html_import():
+    global _te_html_status
+    _te_html_status["running"] = True
+    try:
+        from services.te_html_parser import import_html_file
+        path = _find_te_html()
+        if not path:
+            _te_html_status["last_result"] = {"error": "calendar_data.txt not found — upload first"}
+            return
+        result = import_html_file(path)
+        _te_html_status["last_result"] = result
+    except Exception as e:
+        logger.error(f"[eco/te-html-import] Failed: {e}")
+        _te_html_status["last_result"] = {"error": str(e)}
+    finally:
+        _te_html_status["running"] = False
+
+
+@router.post("/te-html-import")
+def te_html_import(background_tasks: BackgroundTasks) -> Dict[str, Any]:
+    """Parse calendar_data.txt (TE HTML) and upsert into ff_calendar."""
+    if _te_html_status["running"]:
+        raise HTTPException(409, "TE HTML import already running")
+    if not _find_te_html():
+        raise HTTPException(404, "calendar_data.txt not found — upload via POST /api/eco/te-html-upload")
+    background_tasks.add_task(_run_te_html_import)
+    return {"status": "started"}
+
+
+@router.get("/te-html-import/status")
+def te_html_import_status() -> Dict[str, Any]:
+    return _te_html_status
+
+
 # ── FXStreet calendar (no API key required) ───────────────────────────────────
 
 def _run_fxs_sync(weeks_ahead: int):