docs: add DOCKER_GUIDE.md and fix .env parsing; chore: update docker and script configurations

docker/timescaledb.conf

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+# Optimized for Synology DS218+ (2GB RAM, dual-core CPU)
+
+# Required for TimescaleDB
+shared_preload_libraries = 'timescaledb'
+
+# Memory settings
+shared_buffers = 256MB
+effective_cache_size = 768MB
+work_mem = 16MB
+maintenance_work_mem = 128MB
+
+# Connection settings
+listen_addresses = '*'
+max_connections = 50
+max_locks_per_transaction = 256
+max_worker_processes = 2
+max_parallel_workers_per_gather = 1
+max_parallel_workers = 2
+max_parallel_maintenance_workers = 1
+
+# Write performance
+wal_buffers = 16MB
+checkpoint_completion_target = 0.9
+random_page_cost = 1.1
+effective_io_concurrency = 200
+
+# TimescaleDB settings
+timescaledb.max_background_workers = 4
+
+# Logging (use default pg_log directory inside PGDATA)
+logging_collector = on
+log_directory = 'log'
+log_filename = 'postgresql-%Y-%m-%d_%H%M%S.log'
+log_rotation_age = 1d
+log_rotation_size = 100MB
+log_min_messages = warning
+log_min_error_statement = error
+
+# Auto-vacuum for hypertables
+autovacuum_max_workers = 2
+autovacuum_naptime = 10s