fix(precedent-library): allow re-extraction for internal_committee rows

The "חלץ מטא-דאטה" / "חלץ הלכות" buttons in the UI were returning 404
for any precedent with `source_kind != 'external_upload'`. The original
restriction was meant to keep LLM extraction off internal-committee
imports (their metadata supposedly came from the case file system),
but the same precedent rows can still need re-extraction when ingest
produces broken data — e.g. the corrupted `subject_tags` value
`['[','"','ה','י',...]` that motivated this change (an early ingest
stored a JSON literal into a TEXT[] column, which Postgres split into
single chars).

Two changes here:

1. db.request_metadata_extraction / request_halacha_extraction:
   drop the `AND source_kind='external_upload'` filter. The extractor
   already preserves user values (only fills empty fields), so this
   is safe.

2. precedent_metadata_extractor.extract_and_apply: detect the
   character-by-character corruption above and treat it as empty so
   the freshly-extracted tags actually replace the broken ones.
   Heuristic: 3+ elements where every element is at most 2 chars
   (legitimate tags are multi-character Hebrew words).

Coolify deploy required for the FastAPI container to pick this up.

mcp-server/src/legal_mcp/services/precedent_metadata_extractor.py

@@ -223,7 +223,17 @@ async def apply_to_record(
             fields_to_update["key_quote"] = s
 
     cur_tags = record.get("subject_tags") or []
-    if not cur_tags:
+    # Treat character-by-character corruption as empty. Early ingest
+    # pipelines stored a JSON string (`'["היטל השבחה"]'`) into a TEXT[]
+    # column, which Postgres split into individual chars:
+    # `['[', '"', 'ה', 'י', 'ט', 'ל', ' ', 'ה', 'ש', ...]`. Detection:
+    # 3+ elements where every element is at most 2 chars (legitimate
+    # tags are multi-character Hebrew words like `היטל_השבחה`).
+    is_corrupt = (
+        len(cur_tags) >= 3
+        and all(isinstance(t, str) and len(t) <= 2 for t in cur_tags)
+    )
+    if not cur_tags or is_corrupt:
         sug_tags = suggested.get("subject_tags") or []
         if sug_tags:
             fields_to_update["subject_tags"] = sug_tags