feat: short-term memory system

[cmac86]

Summary

• Adds deterministic short-term memory with three storage mechanisms: auto-store from tool memory_hint, explicit memory_short tool (store/get/delete/list), and HTTP API
• File-based JSON persistence on Docker caal-memory volume with 7-day default TTL
• Memory context injected as LLM awareness hint (after first user message) to enable tool chaining — e.g. "is my flight on time?" triggers memory_short(get) → flight_tracker
• Frontend Memory Panel (Brain icon) with entry list, source badges (tool/voice/api), inline edit, and clear all
• i18n translations for en, fr, it
• Fixes Docker permission issues for /app/registry_cache.json and memory persistence

Architecture

src/caal/memory/          # Package (future-proofed for long-term memory)
├── base.py               # Shared types (MemoryEntry, MemorySource, MemoryStore)
├── short_term.py          # ShortTermMemory singleton, file persistence, TTL
└── __init__.py

src/caal/integrations/memory_tool.py  # MemoryTools mixin (memory_short function_tool)

Three storage paths:

1. Tool hint — n8n workflows return memory_hint in response → auto-stored
2. Explicit tool — user says "remember my flight is UA1234" → memory_short(store)
3. HTTP API — POST /memory for external systems

Context injection serves as awareness layer — the LLM sees what's in memory so it knows to chain tools (e.g. pull email from memory → send via Gmail), but retrieval still goes through the tool for verification.

Test plan

• API: store, get, list, delete, clear via curl
• Explicit tool: "remember my flight number is UA1234" → stored and retrievable
• Tool chaining: "is my flight on time?" → memory_short(get) → web_search
• Cross-tool chaining: "email Ashley" → memory_short(get) → gmail(send)
• Clean greeting: memory not announced on session start
• Frontend panel: entries display with source badges, timestamps, TTL
• Inline edit: pencil icon → textarea → save
• Docker persistence: entries survive container restart via /app/data volume

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