feat: Implement v1.1.1 Phase 1 - Core Infrastructure

Phase 1 of v1.1.1 "Polish" release focusing on production readiness.
Implements logging, connection pooling, validation, and error handling.

Following specs in docs/design/v1.1.1/developer-qa.md and ADRs 052-055.

**Structured Logging** (Q3, ADR-054)
- RotatingFileHandler (10MB files, keep 10)
- Correlation IDs for request tracing
- All print statements replaced with logging
- Context-aware correlation IDs (init/request)
- Logs written to data/logs/starpunk.log

**Database Connection Pooling** (Q2, ADR-053)
- Connection pool with configurable size (default: 5)
- Request-scoped connections via Flask g object
- Pool statistics for monitoring
- WAL mode enabled for concurrency
- Backward compatible get_db() signature

**Configuration Validation** (Q14, ADR-052)
- Validates presence and type of all config values
- Fail-fast startup with clear error messages
- LOG_LEVEL enum validation
- Type checking for strings, integers, paths
- Non-zero exit status on errors

**Centralized Error Handling** (Q4, ADR-055)
- Moved handlers to starpunk/errors.py
- Micropub spec-compliant JSON errors
- HTML templates for browser requests
- All errors logged with correlation IDs
- MicropubError exception class

**Database Module Reorganization**
- Moved database.py to database/ package
- Separated init.py, pool.py, schema.py
- Maintains backward compatibility
- Cleaner separation of concerns

**Testing**
- 580 tests passing
- 1 pre-existing flaky test noted
- No breaking changes to public API

**Documentation**
- CHANGELOG.md updated with v1.1.1 entry
- Version bumped to 1.1.1
- Implementation report in docs/reports/

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

starpunk/database/init.py

@@ -0,0 +1,44 @@
+"""
+Database initialization for StarPunk
+"""
+
+import sqlite3
+from pathlib import Path
+from starpunk.database.schema import INITIAL_SCHEMA_SQL
+
+
+def init_db(app=None):
+    """
+    Initialize database schema and run migrations
+
+    Args:
+        app: Flask application instance (optional, for config access)
+    """
+    if app:
+        db_path = app.config["DATABASE_PATH"]
+        logger = app.logger
+    else:
+        # Fallback to default path
+        db_path = Path("./data/starpunk.db")
+        logger = None
+
+    # Ensure parent directory exists
+    db_path.parent.mkdir(parents=True, exist_ok=True)
+
+    # Create database and initial schema
+    conn = sqlite3.connect(db_path)
+    try:
+        conn.executescript(INITIAL_SCHEMA_SQL)
+        conn.commit()
+        if logger:
+            logger.info(f"Database initialized: {db_path}")
+        else:
+            # Fallback logging when logger not available (e.g., during testing)
+            import logging
+            logging.getLogger(__name__).info(f"Database initialized: {db_path}")
+    finally:
+        conn.close()
+
+    # Run migrations
+    from starpunk.migrations import run_migrations
+    run_migrations(db_path, logger=logger)