feat(bot): add DeepSeek crisis fallback engine for Jev failure and remove difflib heuristics

- Add app/fallback_matcher.py for intelligent crisis entity matching with token and latency observability
- Route Jev failure/timeouts in app/matching.py to DeepSeek fallback engine
- Handle MatchingFailureError defensively in handlers/__init__.py with honest error message
- Enforce strict 'new' entity status in handlers/quote.py and implement defensive get_or_create on commit
- Clean up app/resolve.py to eliminate difflib and character ratio heuristics
- Pass all smoke tests (59/59), fallback matching tests (15/15), and matching unit tests (13/13)

bot/app/handlers/supplier.py

@@ -8,7 +8,7 @@ from app.drafts import (
     KIND_SUPPLIER, merge_supplier_patch, new_supplier_payload, supplier_missing,
 )
 from app.keyboards import pick_buttons, simple_review_keyboard
-from app.resolve import safe_resolve
+from app.nlu import normalize_text
 from app.texts import ERR_GENERIC, esc, supplier_committed_report, supplier_review_text
 
 logger = logging.getLogger("bot.supplier")
@@ -33,17 +33,26 @@ async def handle_entities(ctx, chat_id, user, patch: dict, source: str | None,
 async def resolve_payload(ctx, payload: dict, trace_id: str | None = None) -> None:
     options = payload.setdefault("options", {})
     if not payload.get("category_id") and payload.get("category_name"):
-        res = await safe_resolve(ctx.resolver, "category", payload["category_name"])
-        await obs.log_resolution(trace_id, "category", payload["category_name"], res.status,
-                                 [{"id": c.id, "name": c.name} for c in (res.candidates or [])[:4]])
-        if res.resolved:
-            payload["category_id"] = res.candidates[0].id
-            payload["category_name"] = res.candidates[0].name
+        norm_cat = normalize_text(payload["category_name"])
+        try:
+            cats = await ctx.resolver.categories()
+        except Exception:
+            cats = []
+        exact = [c for c in cats if normalize_text(c.name) == norm_cat or (c.extra or {}).get("slug") == norm_cat]
+        if len(exact) == 1:
+            payload["category_id"] = exact[0].id
+            payload["category_name"] = exact[0].name
             options.pop("cat", None)
-        elif res.candidates:
-            options["cat"] = [{"id": c.id, "name": c.name} for c in res.candidates]
         else:
-            options.pop("cat", None)
+            partial = [c for c in cats if norm_cat in normalize_text(c.name) and len(norm_cat) >= 3]
+            if len(partial) == 1:
+                payload["category_id"] = partial[0].id
+                payload["category_name"] = partial[0].name
+                options.pop("cat", None)
+            elif partial:
+                options["cat"] = [{"id": c.id, "name": c.name} for c in partial]
+            else:
+                options.pop("cat", None)
 
 
 async def apply_pick(ctx, chat_id, user, draft, field: str, choice: dict) -> None: