feat: complete DDD Phase 2 - add domain services, infrastructure layers, and shared components

- domain/value_objects: Add Topic, UserTitle, GoldenQuote, Statistics value objects
- domain/services: Add StatisticsCalculator, ReportGenerator domain services
- domain/exceptions: Add comprehensive domain exception hierarchy
- infrastructure/persistence: Add HistoryRepository for data storage
- infrastructure/llm: Add LLMClient wrapper for AstrBot providers
- infrastructure/config: Add ConfigManager for centralized configuration
- infrastructure/resilience: Add CircuitBreaker, RateLimiter, retry utilities
- application: Add SchedulingService, ReportingService application services
- shared: Add constants and TraceContext for request tracing

All imports verified in Docker container.

src/shared/constants.py

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+"""
+Constants - Shared constants used across the plugin
+"""
+
+# Plugin metadata
+PLUGIN_NAME = "astrbot_plugin_qq_group_daily_analysis"
+PLUGIN_VERSION = "2.0.0"
+
+# Platform identifiers
+PLATFORM_ONEBOT = "onebot"
+PLATFORM_TELEGRAM = "telegram"
+PLATFORM_DISCORD = "discord"
+PLATFORM_SLACK = "slack"
+PLATFORM_LARK = "lark"
+
+SUPPORTED_PLATFORMS = [
+    PLATFORM_ONEBOT,
+    # Future platforms
+    # PLATFORM_TELEGRAM,
+    # PLATFORM_DISCORD,
+    # PLATFORM_SLACK,
+    # PLATFORM_LARK,
+]
+
+# Analysis defaults
+DEFAULT_MAX_TOPICS = 5
+DEFAULT_MAX_USER_TITLES = 10
+DEFAULT_MAX_GOLDEN_QUOTES = 5
+DEFAULT_MIN_MESSAGES = 50
+DEFAULT_MAX_TOKENS = 2000
+
+# Time periods
+HOUR_RANGES = {
+    "morning": (6, 12),
+    "afternoon": (12, 18),
+    "evening": (18, 24),
+    "night": (0, 6),
+}
+
+# Report formats
+REPORT_FORMAT_TEXT = "text"
+REPORT_FORMAT_MARKDOWN = "markdown"
+REPORT_FORMAT_IMAGE = "image"
+REPORT_FORMAT_HTML = "html"
+
+# Message content types
+CONTENT_TYPE_TEXT = "text"
+CONTENT_TYPE_IMAGE = "image"
+CONTENT_TYPE_EMOJI = "emoji"
+CONTENT_TYPE_STICKER = "sticker"
+CONTENT_TYPE_FILE = "file"
+CONTENT_TYPE_AUDIO = "audio"
+CONTENT_TYPE_VIDEO = "video"
+CONTENT_TYPE_REPLY = "reply"
+CONTENT_TYPE_AT = "at"
+CONTENT_TYPE_UNKNOWN = "unknown"
+
+# Analysis task states
+TASK_STATE_PENDING = "pending"
+TASK_STATE_RUNNING = "running"
+TASK_STATE_COMPLETED = "completed"
+TASK_STATE_FAILED = "failed"
+TASK_STATE_CANCELLED = "cancelled"
+
+# Error codes
+ERROR_INSUFFICIENT_DATA = "INSUFFICIENT_DATA"
+ERROR_LLM_FAILED = "LLM_FAILED"
+ERROR_PLATFORM_ERROR = "PLATFORM_ERROR"
+ERROR_CONFIG_ERROR = "CONFIG_ERROR"
+ERROR_TIMEOUT = "TIMEOUT"
+
+# Cache TTL (in seconds)
+CACHE_TTL_SHORT = 60  # 1 minute
+CACHE_TTL_MEDIUM = 300  # 5 minutes
+CACHE_TTL_LONG = 3600  # 1 hour
+CACHE_TTL_DAY = 86400  # 24 hours
+
+# Rate limiting defaults
+RATE_LIMIT_LLM_CALLS = 10  # calls per minute
+RATE_LIMIT_API_CALLS = 60  # calls per minute
+RATE_LIMIT_BURST = 5  # burst size
+
+# Retry defaults
+RETRY_MAX_ATTEMPTS = 3
+RETRY_BASE_DELAY = 1.0
+RETRY_MAX_DELAY = 30.0
+
+# File paths
+HISTORY_DIR = "history"
+CACHE_DIR = "cache"
+TEMP_DIR = "temp"