fix: replace personal filesystem paths with env vars / config

- docker-compose.yml: hardcoded iCloud Obsidian vault volume → ${OMBRE_HOST_VAULT_DIR:-./buckets}
- write_memory.py / migrate_to_domains.py / reclassify_domains.py / reclassify_api.py:
  hardcoded ~/Documents/Obsidian Vault/Ombre Brain → OMBRE_BUCKETS_DIR > load_config() > ./buckets
- write_memory.py: also fix B-04 regression (activation_count: 1 → 0 in frontmatter template)
- reclassify_api.py: model + base_url now read from config (was hardcoded SiliconFlow / DeepSeek-V3)
- tests/dataset.py + test_feel_flow.py: anonymize fixture identifiers (P酱/P0lar1s/北极星 → TestUser/北方)

Project identifiers (git.p0lar1s.uk, p0luz/ombre-brain, P0luz/Ombre-Brain GitHub) intentionally retained as project branding per user decision.

write_memory.py

@@ -12,7 +12,28 @@ import uuid
 import argparse
 from datetime import datetime
 
-VAULT_DIR = os.path.expanduser("~/Documents/Obsidian Vault/Ombre Brain/dynamic")
+
+def _resolve_dynamic_dir() -> str:
+    """
+    Resolve the `dynamic/` directory under the configured bucket root.
+    Priority: $OMBRE_BUCKETS_DIR > config.yaml > built-in default.
+    优先级：环境变量 > config.yaml > 内置默认。
+    """
+    env_dir = os.environ.get("OMBRE_BUCKETS_DIR", "").strip()
+    if env_dir:
+        return os.path.join(os.path.expanduser(env_dir), "dynamic")
+    try:
+        from utils import load_config  # local import to avoid hard dep when missing
+        cfg = load_config()
+        return os.path.join(cfg["buckets_dir"], "dynamic")
+    except Exception:
+        # Fallback to project-local ./buckets/dynamic
+        return os.path.join(
+            os.path.dirname(os.path.abspath(__file__)), "buckets", "dynamic"
+        )
+
+
+VAULT_DIR = _resolve_dynamic_dir()
 
 
 def gen_id():
@@ -36,7 +57,7 @@ def write_memory(
     tags_yaml = "\n".join(f"- {t}" for t in tags)
 
     md = f"""---
-activation_count: 1
+activation_count: 0
 arousal: {arousal}
 created: '{now}'
 domain: