refactor(api): TOML 配置 SSOT、统一错误契约、Auth/事务加固与可观测性 (#33)

配置 SSOT（TOML + .env）
统一错误契约
Auth 与事务边界
Redis / Celery 可靠性:业务 Redis（DB/0）与 Celery broker/backend（DB/1）显式拆分；连接池、sync client
可观测性（OpenTelemetry + LGTM）

api/config/default.toml

@@ -0,0 +1,239 @@
+# Life Echo API — default configuration (SSOT base layer)
+# Environment overlays: config/development.toml | staging.toml | production.toml
+
+[deploy]
+alembic_startup_fail_fast = false
+access_token_expire_minutes = 120
+refresh_token_expire_days = 30
+refresh_token_reuse_grace_seconds = 30
+mock_sms_login_enabled = false
+tencent_sms_sdk_app_id = ""
+tencent_sms_sign_name = ""
+tencent_sms_template_id = ""
+tencent_cos_bucket = ""
+tencent_cos_base_url = ""
+enable_tts = true
+memoir_image_enabled = false
+enable_docs = true
+wechat_pay_app_id = ""
+wechat_pay_mch_id = ""
+wechat_pay_private_key_path = "certs/apiclient_key.pem"
+wechat_pay_cert_serial_no = ""
+wechat_pay_notify_url = ""
+wechat_pay_platform_public_key_path = ""
+wechat_pay_platform_public_key_id = ""
+alipay_app_id = ""
+alipay_notify_url = ""
+liblib_template_uuid = ""
+log_level = "INFO"
+otel_enabled = false
+otel_exporter_otlp_endpoint = "http://localhost:48317"
+api_cors_origins = ""
+
+[chat]
+interview_max_tokens = 512
+interview_max_segments = 2
+interview_max_chars_per_segment = 380
+opening_max_tokens = 380
+profile_followup_max_tokens = 280
+history_max_pairs = 15
+history_max_chars = 6000
+era_context_enabled = true
+stage_detection_enabled = true
+stage_detection_max_tokens = 128
+interview_persona = "default"
+interview_temperature = 0.93
+memory_retrieval_enabled = true
+memory_top_k = 8
+memory_evidence_max_chars = 4096
+memory_safe_evidence_format_enabled = true
+reply_planner_llm_enabled = false
+reply_planner_max_tokens = 256
+reply_planner_temperature = 0.2
+re_greeting_enabled = true
+re_greeting_idle_hours = 6.0
+topic_chips_enabled = true
+topic_chips_max = 4
+input_normalize_enabled = true
+input_normalize_mode = "rules"
+input_normalize_llm_max_tokens = 512
+input_normalize_llm_max_input_chars = 8000
+input_normalize_llm_voice_only = true
+profile_max_turns = 8
+profile_extract_max_tokens = 512
+
+[memoir]
+fidelity_check_enabled = true
+fidelity_check_max_tokens = 512
+oral_normalize_enabled = true
+oral_normalize_mode = "rules"
+oral_normalize_llm_max_tokens = 512
+oral_normalize_llm_max_input_chars = 8000
+phase1_batch_llm_enabled = true
+phase1_batch_llm_max_tokens = 4096
+phase1_batch_llm_chunk_size = 24
+pipeline_run_ttl_seconds = 172800
+extraction_max_tokens = 1024
+classification_max_tokens = 256
+narrative_max_tokens = 4096
+narrative_merge_max_tokens = 8192
+title_max_tokens = 256
+story_route_max_tokens = 1024
+story_batch_plan_max_tokens = 4096
+segment_batch_min_chars = 50
+segment_batch_max_wait_seconds = 60.0
+narrative_immediate_char_threshold = 50
+narrative_batch_min_segments = 3
+narrative_batch_min_chars = 80
+narrative_batch_max_wait_seconds = 120.0
+extraction_updates_current_stage = false
+fidelity_fail_open_on_parse_error = false
+narrative_evidence_overlap_min_chars = 14
+evidence_scene_anchor_check_enabled = true
+title_slots_require_body_or_oral_match = true
+title_hay_grounding_strict_phrases_enabled = true
+recompose_retry_on_lock_contention = true
+phase2_singleflight_immediate = true
+route_defer_enabled = true
+route_defer_seconds = 120.0
+route_defer_max_attempts = 3
+quality_pass_enabled = true
+quality_pass_delay_seconds = 5
+story_route_append_guardrail_oral_chars = 1800
+min_inline_images_for_chapter_cover = 1
+image_poll_interval = 3
+image_max_attempts = 20
+image_provider = "liblib"
+image_style_default = "watercolor"
+image_size_default = "1280x720"
+image_download_hosts = ""
+image_prompt_fallback_disabled = false
+
+[memory]
+enrichment_enabled = true
+enrichment_max_chars = 12000
+compaction_enabled = true
+compaction_debounce_seconds = 105
+compaction_lock_ttl_seconds = 600
+compaction_chunk_similarity_threshold = 0.92
+compaction_min_layers_for_exclude = 2
+compaction_max_chunks_per_run = 200
+compaction_max_excludes_per_run = 50
+compaction_max_neighbors_per_chunk = 25
+compaction_text_jaccard_min = 0.55
+compaction_metadata_event_year_window = 1
+compaction_sweep_recent_hours = 24
+
+[story]
+image_min_body_chars = 400
+image_enqueue_dedup_ttl = 300
+recompose_chapter_delay_seconds = 8
+chapter_pipeline_lock_ttl_seconds = 360
+append_max_canonical_chars = 12000
+append_max_versions = 20
+route_candidate_body_max_chars = 2200
+route_candidate_total_max_chars = 20000
+route_long_body_head_chars = 700
+route_long_body_tail_chars = 700
+route_summary_min_chars = 30
+route_index_preview_chars = 140
+title_min_body_chars = 60
+evidence_top_k_default = 10
+evidence_top_k_large_batch = 5
+evidence_large_batch_threshold = 3
+
+[eval]
+judge_base_url = "https://open.bigmodel.cn/api/paas/v4"
+judge_model = "glm-5"
+judge_temperature = 0.3
+judge_deepseek_model = "deepseek-v4-flash"
+judge_deepseek_thinking_enabled = false
+judge_deepseek_context_window_tokens = 64000
+judge_context_window_tokens = 200000
+judge_completion_reserve_tokens = 4096
+judge_prompt_budget_safety_tokens = 2048
+judge_approx_tokens_per_char = 1.0
+judge_max_transcript_chars = 0
+judge_max_compare_transcript_chars_each = 0
+judge_compare_prompt_overhead_chars = 10000
+judge_memoir_chapter_concurrency = 4
+judge_memoir_body_max_chars = 36000
+judge_memoir_evidence_max_chars = 32000
+judge_memoir_completion_max_tokens = 3072
+candidate_temperature = 0.7
+gate_protected_regression_threshold = 2.0
+execution_enabled = true
+internal_enable_docs = false
+internal_cors_origins = ""
+
+[llm]
+deepseek_base_url = "https://api.deepseek.com"
+deepseek_model = "deepseek-v4-flash"
+deepseek_thinking_enabled = false
+temperature = 0.7
+fast_model = ""
+embedding_base_url = "https://open.bigmodel.cn/api/paas/v4"
+embedding_model = "embedding-3"
+
+[asr]
+provider = "whisper"
+model_size = "small"
+device = "auto"
+compute_type = "auto"
+model_cache_dir = ""
+
+[tts]
+provider = "tencent"
+voice_type = 501004
+voice_type_en = 501004
+codec = "mp3"
+
+[redis]
+socket_timeout_seconds = 5.0
+socket_connect_timeout_seconds = 2.0
+health_check_interval_seconds = 30
+task_tracker_ttl_seconds = 86400
+
+[celery]
+memory_enrichment_queue = "memory_idle"
+broker_pool_limit = 10
+broker_connection_retry_on_startup = true
+memoir_soft_time_limit = 1800
+memoir_hard_time_limit = 2400
+image_soft_time_limit = 600
+image_hard_time_limit = 900
+compaction_sweep_soft_time_limit = 300
+compaction_sweep_hard_time_limit = 600
+enrichment_soft_time_limit = 660
+enrichment_hard_time_limit = 960
+
+[alembic]
+run_on_startup = true
+max_retries = 3
+retry_base_seconds = 1.0
+
+[agent_log]
+agent_verbose = false
+max_chars = 4096
+omit_system_message_body = true
+json_prompt_prefix_chars = 0
+json_prompt_prefix_only_if_len_gt = 4000
+prompt_mode = "preview"
+prompt_dedup = false
+celery_log_level = ""
+httpx_log_level = ""
+log_json_file = ""
+
+[otel]
+exporter_insecure = true
+service_name = "life-echo-api"
+metric_export_interval_ms = 10000
+
+[misc]
+algorithm = "HS256"
+redis_session_ttl = 86400
+tencent_sms_template_param_count = 2
+tencent_cos_region = "ap-shanghai"
+liblib_base_url = "https://openapi.liblibai.cloud"
+alipay_sign_type = "RSA2"
+alipay_under_development = "true"