feat: structured user profile with LLM-learned preferences

Replaces the freeform briefing-profile note with a DB-backed user_profiles
table. Users can edit job/industry/expertise/response preferences/interests/
work schedule via a new Settings → Profile tab. The LLM appends nightly
observations; at 14+ entries they are auto-consolidated into a learned_summary.
Profile context is injected into both briefing and chat system prompts.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/fabledassistant/routes/profile.py

@@ -0,0 +1,61 @@
+from quart import Blueprint, jsonify, request
+
+from fabledassistant.auth import get_current_user_id, login_required
+from fabledassistant.services.user_profile import (
+    VALID_EXPERTISE,
+    VALID_STYLES,
+    VALID_TONES,
+    clear_learned_data,
+    consolidate_observations,
+    get_profile,
+    update_profile,
+)
+
+profile_bp = Blueprint("profile", __name__, url_prefix="/api/profile")
+
+
+@profile_bp.route("", methods=["GET"])
+@login_required
+async def get_profile_route():
+    uid = get_current_user_id()
+    profile = await get_profile(uid)
+    return jsonify(profile.to_dict())
+
+
+@profile_bp.route("", methods=["PUT"])
+@login_required
+async def update_profile_route():
+    uid = get_current_user_id()
+    data = await request.get_json()
+    if not isinstance(data, dict):
+        return jsonify({"error": "Expected a JSON object"}), 400
+
+    if "expertise_level" in data and data["expertise_level"] not in VALID_EXPERTISE:
+        return jsonify({"error": f"expertise_level must be one of {sorted(VALID_EXPERTISE)}"}), 400
+    if "response_style" in data and data["response_style"] not in VALID_STYLES:
+        return jsonify({"error": f"response_style must be one of {sorted(VALID_STYLES)}"}), 400
+    if "tone" in data and data["tone"] not in VALID_TONES:
+        return jsonify({"error": f"tone must be one of {sorted(VALID_TONES)}"}), 400
+    if "interests" in data and not isinstance(data["interests"], list):
+        return jsonify({"error": "interests must be an array"}), 400
+    if "work_schedule" in data and not isinstance(data["work_schedule"], dict):
+        return jsonify({"error": "work_schedule must be an object"}), 400
+
+    profile = await update_profile(uid, data)
+    return jsonify(profile.to_dict())
+
+
+@profile_bp.route("/consolidate", methods=["POST"])
+@login_required
+async def trigger_consolidate():
+    uid = get_current_user_id()
+    summary = await consolidate_observations(uid)
+    return jsonify({"status": "ok", "learned_summary": summary})
+
+
+@profile_bp.route("/observations", methods=["DELETE"])
+@login_required
+async def clear_observations():
+    uid = get_current_user_id()
+    await clear_learned_data(uid)
+    return jsonify({"status": "ok"})