feat(tools): owner feedback review surface + tool_feedback migration

Adds the missing migration for the tool_feedback table (dobetternorge_maindb)
that the in-result feedback widget writes to, repoints api/feedback.php to
dbnmDb() for consistency with the engine-config table, and adds an owner-only
dashboard (page + read API + nav) summarising ratings and notes by tool/engine.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

migrations/maindb/002_tool_feedback.sql

@@ -0,0 +1,26 @@
+-- 002_tool_feedback.sql
+-- Target DB: dobetternorge_maindb (the tools' operational DB, via dbnmDb()).
+-- Run manually after a mysqldump backup. Idempotent (IF NOT EXISTS).
+--
+-- Per-tool thumbs up/down + optional "what was missed or wrong" note, captured by
+-- the in-result feedback widget (assets/js/tools.js) via api/feedback.php.
+-- Metadata + voluntary comment only — NO pasted case content (process-and-forget).
+--
+-- tool             : tool slug the result came from (ask|summarize|redact|timeline|...)
+-- rating           : positive | negative
+-- engine           : the engine string that produced the result (best-effort, client-supplied)
+-- missed_or_wrong  : short optional free-text note (what the tool missed/got wrong)
+-- session_id       : PHP session id (coarse de-dupe / abuse signal), not a user identity
+
+CREATE TABLE IF NOT EXISTS tool_feedback (
+    id              INT UNSIGNED NOT NULL AUTO_INCREMENT,
+    session_id      VARCHAR(40)  DEFAULT NULL,
+    tool            VARCHAR(30)  NOT NULL,
+    rating          ENUM('positive','negative') NOT NULL,
+    missed_or_wrong TEXT         DEFAULT NULL,
+    engine          VARCHAR(60)  DEFAULT NULL,
+    created_at      TIMESTAMP    NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    PRIMARY KEY (id),
+    KEY idx_tool (tool),
+    KEY idx_created (created_at)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;