models: align translation column naming + add token counts

Three recently-added tables (strategic_log_translations,
indicator_summary_translations, csv_format_templates) drifted from
the codebase's existing naming convention:
- llm_model -> model
- llm_cost_usd -> cost_usd
- content_md -> content  (on the two translation tables; csv_format
  doesn't have a content field)

Also added prompt_tokens and completion_tokens to the three tables;
they were silently dropped at write time despite LogResult exposing
them.

All writer call sites (ai_log_job, indicator_summary_job,
llm_csv_parser) and reader call sites (api.py localized helpers)
updated to match. Tests realigned.

Migration 0025 uses batch_alter_table for SQLite compatibility.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

app/routers/api.py

@@ -326,7 +326,7 @@ async def _localized_content(
     row: StrategicLog | None,
     principal: CurrentUser | None,
 ) -> str | None:
-    """Return the translated content_md for ``row`` when the principal has
+    """Return the translated content for ``row`` when the principal has
     a non-English lang preference and a matching translation row exists.
     Returns None to signal 'use row.content as-is' (the default English
     path)."""
@@ -340,7 +340,7 @@ async def _localized_content(
         .where(StrategicLogTranslation.log_id == row.id)
         .where(StrategicLogTranslation.lang == lang)
     )).scalar_one_or_none()
-    return t.content_md if t is not None else None
+    return t.content if t is not None else None
 
 
 async def _apply_localized_summary(
@@ -364,7 +364,7 @@ async def _apply_localized_summary(
         .where(IndicatorSummaryTranslation.lang == lang)
     )).scalar_one_or_none()
     if t is not None:
-        row.content = t.content_md
+        row.content = t.content
 
 
 def _resolve_tone_param(tone: str | None) -> str: