feat: add environment endpoint for weather, forecast, and sun data

Add GET /tools/environment endpoint that fetches weather, forecast, sun times,
and air quality data from user's volatile Qdrant collection.

- Add qdrant-client dependency
- Create QdrantReadClient wrapper for read-only queries
- Add environment schemas and service in tools domain
- Parse weather, forecast, sun times, and air quality from Qdrant payloads
- Support user-specific collections via preferred_username from OIDC
- Add comprehensive service tests (13 tests)

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CHANGELOG.md

@@ -5,6 +5,22 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.10.0] - 2026-01-06
+
+### Added
+
+- **Environment Data API** - Qdrant-backed endpoint for weather, forecast, and sun position data
+  - `GET /tools/environment` - Fetch environment data from user's volatile collection
+  - Weather: current temperature, conditions, humidity, wind speed
+  - Forecast: multi-day outlook with high/low temperatures
+  - Sun times: sunrise, sunset, daylight duration
+  - Air quality: AQI and quality level (when available)
+  - Data sourced from `volatile_{user}` Qdrant collection
+  - Uses `preferred_username` from OIDC, falls back to `default`
+- `qdrant-client` dependency for vector database access
+- `QdrantReadClient` wrapper for read-only collection queries
+- Comprehensive test suite for environment service parsing
+
 ## [1.9.4] - 2026-01-04
 
 ### Fixed