feat(reports): FTP night-report pipeline foundation

Terra-View side of the daily night-vs-baseline sound report for the John Myler
24/7 job. Engine is built and verified end-to-end against real meter data;
SMTP send + scheduler/capture wiring still pending.

- ingest: refactor upload_nrl_data into a callable ingest_nrl_zip(location_id,
  zip_bytes, db) sharing one core with the HTTP endpoint. Capture the .rnh
  percentile map + weightings into session metadata; dedup on store-name +
  start time. Ingest stays metric-agnostic (every Leq column preserved).
- report_pipeline.py: metric registry, Evening/Nighttime windows, correct
  aggregation (Lmax=max, Ln=arithmetic, Leq=logarithmic), baseline = typical
  night, per-location + per-project builders.
- report_renderers.py: HTML email-body renderer (Last/Base/delta layout).
- report_email.py: config-driven SMTP via stdlib (env vars) with a dry-run
  fallback so the pipeline runs without credentials.
- report_orchestrator.py: compute -> render -> always write report.html +
  report.json to disk -> best-effort email.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

backend/services/report_orchestrator.py

@@ -0,0 +1,130 @@
+"""
+Nightly Report Orchestrator.
+
+Ties the pieces together: compute → render → write-to-disk → email.
+
+This is what the daily cycle (or a manual trigger) calls.  It ALWAYS writes the
+rendered report to disk — `data/reports/{project_id}/{night_date}/report.html`
+(+ `report.json` with the raw numbers) — so there's a viewable artifact even
+when email is in dry-run (SMTP not configured yet).  The email step is
+best-effort and never aborts the run.
+"""
+
+from __future__ import annotations
+
+import json
+import logging
+from datetime import date
+from pathlib import Path
+from typing import Optional
+
+from sqlalchemy.orm import Session
+
+from backend.services.report_pipeline import (
+    ProjectNightReport, build_project_night_report, Window,
+)
+from backend.services.report_renderers import render_html_summary
+from backend.services.report_email import send_report_email, Attachment
+
+logger = logging.getLogger(__name__)
+
+DEFAULT_OUTPUT_ROOT = "data/reports"
+
+
+def _report_to_dict(report: ProjectNightReport) -> dict:
+    """Serialise the report data model to plain JSON (for the on-disk record)."""
+    return {
+        "project_id": report.project_id,
+        "project_name": report.project_name,
+        "night_date": report.night_date.isoformat(),
+        "metrics": [m.key for m in report.metrics],
+        "locations": [
+            {
+                "name": loc.location_name,
+                "night_interval_count": loc.night_interval_count,
+                "baseline_nights_used": loc.baseline_nights_used,
+                "notes": loc.notes,
+                "windows": {
+                    w.key: {
+                        "label": w.label,
+                        "metrics": {
+                            m.key: {
+                                "label": m.label,
+                                "last_night": loc.table[w.key][m.key].last_night,
+                                "baseline": loc.table[w.key][m.key].baseline,
+                                "delta": loc.table[w.key][m.key].delta,
+                            }
+                            for m in loc.metrics
+                        },
+                    }
+                    for w in loc.windows
+                },
+            }
+            for loc in report.locations
+        ],
+    }
+
+
+def run_nightly_report(
+    db: Session,
+    project_id: str,
+    night_date: date,
+    *,
+    metric_keys: Optional[list[str]] = None,
+    windows: Optional[list[Window]] = None,
+    baseline_start: Optional[date] = None,
+    baseline_end: Optional[date] = None,
+    recipients: Optional[list[str]] = None,
+    output_root: str = DEFAULT_OUTPUT_ROOT,
+    send: bool = True,
+) -> dict:
+    """Build, persist, and (dry-run) email the night report for a project.
+
+    Returns a result dict with the on-disk artifact paths and the email result.
+    Designed to be called from the daily cycle or a manual trigger.
+    """
+    report = build_project_night_report(
+        db, project_id, night_date,
+        metric_keys=metric_keys, windows=windows,
+        baseline_start=baseline_start, baseline_end=baseline_end,
+    )
+
+    html = render_html_summary(report)
+    subject = f"{report.project_name} — night report {night_date:%m/%d/%y}"
+
+    # --- Always persist a viewable copy ---
+    out_dir = Path(output_root) / project_id / f"{night_date:%Y-%m-%d}"
+    out_dir.mkdir(parents=True, exist_ok=True)
+    html_path = out_dir / "report.html"
+    html_path.write_text(html, encoding="utf-8")
+    json_path = out_dir / "report.json"
+    json_path.write_text(json.dumps(_report_to_dict(report), indent=2), encoding="utf-8")
+
+    # --- Excel attachment (renderer not built yet — held until metric set is final) ---
+    attachments: list[Attachment] = []
+
+    # --- Email (best-effort; dry-run until SMTP is configured) ---
+    email_result = {"sent": False, "dry_run": False, "skipped": True, "error": None}
+    if send:
+        email_result = send_report_email(
+            subject, html, attachments=attachments, recipients=recipients,
+        )
+
+    result = {
+        "project_id": project_id,
+        "project_name": report.project_name,
+        "night_date": night_date.isoformat(),
+        "subject": subject,
+        "location_count": len(report.locations),
+        "html_path": str(html_path),
+        "json_path": str(json_path),
+        "email": email_result,
+    }
+    logger.info(
+        "Nightly report for %s (%s): %d location(s) → %s; email=%s",
+        report.project_name, night_date, len(report.locations), html_path,
+        "sent" if email_result.get("sent") else
+        ("dry-run" if email_result.get("dry_run") else
+         ("skipped" if email_result.get("skipped") else f"error: {email_result.get('error')}")),
+    )
+    return result