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>

tests/test_llm_csv_parser.py

@@ -22,8 +22,10 @@ def test_csv_format_template_model_columns():
     assert "first_seen_at" in cols
     assert "use_count" in cols
     assert "last_used_at" in cols
-    assert "llm_model" in cols
-    assert "llm_cost_usd" in cols
+    assert "model" in cols
+    assert "cost_usd" in cols
+    assert "prompt_tokens" in cols
+    assert "completion_tokens" in cols
     # Crucially, no user attribution.
     assert "user_id" not in cols
     assert "first_seen_user_id" not in cols
@@ -330,7 +332,7 @@ async def test_parse_with_llm_cache_miss_inserts_template(db_factory):
     assert tmpl.mapping["ticker_col"] == "Symbol"
     assert tmpl.broker_label == "Generic broker"
     assert tmpl.use_count == 1
-    assert tmpl.llm_cost_usd == pytest.approx(0.0002)
+    assert tmpl.cost_usd == pytest.approx(0.0002)
     # The crucial PII guarantee:
     assert not hasattr(tmpl, "user_id"), "sample row must not be linked to a user"
 
@@ -365,8 +367,8 @@ async def test_parse_with_llm_cache_hit_skips_llm(db_factory):
             first_seen_at=utcnow(),
             last_used_at=utcnow(),
             use_count=1,
-            llm_model="seed",
-            llm_cost_usd=0.0,
+            model="seed",
+            cost_usd=0.0,
         ))
         await session.commit()
 
@@ -410,7 +412,7 @@ async def test_parse_with_llm_stale_mapping_raises_but_does_not_evict(db_factory
             mapping={"ticker_col": "Symbol", "qty_col": "Symbol"},
             preamble_rows=0, delimiter=",", broker_label=None,
             first_seen_at=utcnow(), last_used_at=utcnow(), use_count=1,
-            llm_model="seed", llm_cost_usd=0.0,
+            model="seed", cost_usd=0.0,
         ))
         await session.commit()