feat: LLM-powered second-pass ingredient matcher + matcher improvements

Matcher improvements (matcher.py):
- Plural normalization: 'tortillas'→'tortilla', 'thighs'→'thigh' so
  subset recall check works without stemmer
- Precision floor lowered 0.45→0.30: allows 'Bacon'→'Wright Brand Bacon'
  (1/3=0.33) while exclusion words still block category contaminants
- _EXCLUSION_WORDS now normalized through same singularizer for consistency

LLM second-pass (llm_matcher.py):
- run_llm_match_job(): for each still-unmatched ingredient, collects top-12
  candidates from grocery catalog ranked by fuzzy×precision (same metric as
  AUTO matcher), then asks Ollama to pick the best match
- Candidate scoring: combined = (partial_token_sort_ratio/100) × precision
  ensures "McCormick Black Pepper" outranks "Dr Pepper" for 'Black Pepper'
- Stores picks as source='auto_llm' (confidence=0.750)
- Ollama Cloud endpoint: https://ollama.com/v1, model: kimi-k2.6:cloud

Migration 0010: adds 'auto_llm' to ingredient_match_source_enum

Config: OLLAMA_BASE_URL / OLLAMA_API_KEY / OLLAMA_MODEL settings
Docker-compose: wires all three Ollama + Spoonacular env vars to backend/scheduler
Scraper service: calls run_llm_match_job after run_match_job on every scrape

Results: AUTO matcher went from 36→25 unmatched (plural normalization fix),
LLM added 3 more (Black Pepper, Zucchini, Chicken Thighs).
Remaining 22 are genuine Lucky CA catalog gaps (standalone olive oil,
dried spices, etc. not in Swiftly weekly ad).

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>

docker-compose.yml

@@ -11,6 +11,9 @@ services:
       - DATABASE_URL=postgresql://mealplanner:${POSTGRES_PASSWORD}@db:5432/mealplanner
       - SENDGRID_API_KEY=${SENDGRID_API_KEY}
       - SPOONACULAR_API_KEY=${SPOONACULAR_API_KEY}
+      - OLLAMA_BASE_URL=${OLLAMA_BASE_URL:-https://ollama.com/v1}
+      - OLLAMA_API_KEY=${OLLAMA_API_KEY}
+      - OLLAMA_MODEL=${OLLAMA_MODEL:-kimi-k2.6:cloud}
       - LUCKY_CA_URL=${LUCKY_CA_URL:-https://luckysupermarkets.com}
       - LUCKY_STORE_ID=${LUCKY_STORE_ID:-757}
       - SWIFTLY_API_BASE=${SWIFTLY_API_BASE:-https://prod.swiftlyapi.net}
@@ -42,6 +45,9 @@ services:
       - DATABASE_URL=postgresql://mealplanner:${POSTGRES_PASSWORD}@db:5432/mealplanner
       - SENDGRID_API_KEY=${SENDGRID_API_KEY}
       - SPOONACULAR_API_KEY=${SPOONACULAR_API_KEY}
+      - OLLAMA_BASE_URL=${OLLAMA_BASE_URL:-https://ollama.com/v1}
+      - OLLAMA_API_KEY=${OLLAMA_API_KEY}
+      - OLLAMA_MODEL=${OLLAMA_MODEL:-kimi-k2.6:cloud}
       - LUCKY_CA_URL=${LUCKY_CA_URL:-https://luckysupermarkets.com}
       - LUCKY_STORE_ID=${LUCKY_STORE_ID:-757}
       - SWIFTLY_API_BASE=${SWIFTLY_API_BASE:-https://prod.swiftlyapi.net}