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_renderers.py

@@ -0,0 +1,114 @@
+"""
+Nightly Report Renderers.
+
+Pluggable renderers over the `report_pipeline` data model.  v1 ships the HTML
+email body + the Excel attachment; PDF and an inline chart image are v1.1
+(each needs a new dependency).  Keeping renderers separate from the compute
+core means a future report wizard just toggles metrics/renderers — the data
+model is unchanged.
+
+Email-client constraints: the HTML uses a table layout with **inline styles
+only** (no <style> blocks, no external CSS, no fl/grid), which is the reliable
+common denominator across Outlook / Gmail / Apple Mail.
+"""
+
+from __future__ import annotations
+
+from html import escape
+
+from backend.services.report_pipeline import ProjectNightReport, LocationNightReport
+
+
+# Colours: louder-than-baseline reads as a concern (red), quieter as fine (green).
+_RED = "#b00020"
+_GREEN = "#1a7f37"
+_GREY = "#888888"
+
+
+def _fmt_value(v) -> str:
+    return f"{v:.1f}" if isinstance(v, (int, float)) else "—"
+
+
+def _fmt_delta(v) -> str:
+    """Signed delta with colour; positive (louder) = red, negative (quieter) = green."""
+    if not isinstance(v, (int, float)):
+        return f'<span style="color:{_GREY}">—</span>'
+    if v > 0:
+        return f'<span style="color:{_RED}">+{v:.1f}</span>'
+    if v < 0:
+        return f'<span style="color:{_GREEN}">{v:.1f}</span>'
+    return f'<span style="color:{_GREY}">0.0</span>'
+
+
+def _location_table(loc: LocationNightReport) -> str:
+    """One location block: heading + Metric × (window: Last / Base / Δ) table."""
+    th = ('padding:5px 9px;border:1px solid #ccc;background:#f2f2f2;'
+          'font:bold 12px Arial,sans-serif;text-align:center')
+    sub = ('padding:4px 8px;border:1px solid #ccc;background:#fafafa;'
+           'font:11px Arial,sans-serif;text-align:center;color:#555')
+    td = 'padding:4px 9px;border:1px solid #ccc;font:12px Arial,sans-serif;text-align:center'
+    td_l = 'padding:4px 9px;border:1px solid #ccc;font:bold 12px Arial,sans-serif;text-align:left'
+
+    # Top header: blank label cell + each window spanning Last/Base/Δ
+    top = f'<th rowspan="2" style="{th}">Metric (dBA)</th>'
+    for w in loc.windows:
+        top += f'<th colspan="3" style="{th}">{escape(w.label)}</th>'
+    sub_row = ''.join(
+        f'<th style="{sub}">Last</th><th style="{sub}">Base</th><th style="{sub}">&Delta;</th>'
+        for _ in loc.windows
+    )
+
+    body = ''
+    for m in loc.metrics:
+        cells = ''
+        for w in loc.windows:
+            cp = loc.table[w.key][m.key]
+            cells += (f'<td style="{td}">{_fmt_value(cp.last_night)}</td>'
+                      f'<td style="{td}">{_fmt_value(cp.baseline)}</td>'
+                      f'<td style="{td}">{_fmt_delta(cp.delta)}</td>')
+        body += f'<tr><td style="{td_l}">{escape(m.label)}</td>{cells}</tr>'
+
+    meta = (f'{loc.night_interval_count} intervals'
+            + (f' · baseline = {loc.baseline_nights_used} night(s)'
+               if loc.baseline_nights_used else ' · no baseline yet'))
+    notes = ''
+    if loc.notes:
+        notes = ('<div style="font:11px Arial,sans-serif;color:#b00020;margin:2px 0 0">'
+                 + '<br>'.join(escape(n) for n in loc.notes) + '</div>')
+
+    return (
+        f'<h3 style="font:bold 15px Arial,sans-serif;margin:18px 0 4px">{escape(loc.location_name)}</h3>'
+        f'<div style="font:11px Arial,sans-serif;color:#666;margin:0 0 6px">{escape(meta)}</div>'
+        f'<table style="border-collapse:collapse;border:1px solid #ccc">'
+        f'<thead><tr>{top}</tr><tr>{sub_row}</tr></thead>'
+        f'<tbody>{body}</tbody></table>{notes}'
+    )
+
+
+def render_html_summary(report: ProjectNightReport) -> str:
+    """Render the full email-body HTML for a project's night report."""
+    windows_desc = ", ".join(w.label for w in (report.locations[0].windows if report.locations else []))
+    header = (
+        f'<h2 style="font:bold 18px Arial,sans-serif;margin:0 0 2px">'
+        f'{escape(report.project_name)} — Night Report</h2>'
+        f'<div style="font:13px Arial,sans-serif;color:#444;margin:0 0 4px">'
+        f'Night of {report.night_date:%a %m/%d/%y} &nbsp;·&nbsp; last night vs. baseline</div>'
+        f'<div style="font:11px Arial,sans-serif;color:#888;margin:0 0 10px">'
+        f'Windows: {escape(windows_desc)}. '
+        f'&Delta; = last night minus baseline (<span style="color:{_RED}">+ louder</span>, '
+        f'<span style="color:{_GREEN}">− quieter</span>). '
+        f'LAmax = loudest interval; L-values are arithmetic averages; '
+        f'baseline = typical night.</div>'
+    )
+
+    if not report.locations:
+        body = ('<div style="font:13px Arial,sans-serif;color:#b00020">'
+                'No sound locations found for this project.</div>')
+    else:
+        body = ''.join(_location_table(loc) for loc in report.locations)
+
+    footer = ('<div style="font:10px Arial,sans-serif;color:#aaa;margin-top:18px">'
+              'Automated report — Terra-View. Full interval data in the attached spreadsheet.</div>')
+
+    return (f'<!DOCTYPE html><html><body style="margin:0;padding:16px;background:#fff">'
+            f'{header}{body}{footer}</body></html>')