v0.7.5: bundled PG tools, schema CRUD, object search, copy-as-DDL, object dependencies (#11)

* chore: bump version to 0.7.5 (Task 1.1)

* feat(db): pure object DDL/search/depend builders (Task 1.2)

* feat(models): ObjectSearchHit, DependencyInfo, PgToolPaths, tool source fields (Task 1.3)

* feat(backup): bundle-aware pg tool resolution, system-first fallback (Task 2.1)

* feat(objects): schema CRUD commands + integration test (Task 2.2)

* feat(objects): search_objects command (current-schema, all types) (Task 2.3)

* feat(objects): get_object_ddl for all browsable types (Task 2.4)

* feat(objects): pg_depend object dependencies + schema contents (Task 2.5)

* feat(ipc): register object management commands (Task 3.1)

* feat(ipc): frontend wrappers + types for object management (Task 3.2)

* feat(build): declare bundled pg_tools resources (Task 3.3)

* test(capabilities): lock objects capability PG-only for search/ddl/dependencies (Task 3.4)

* feat(ui): Cmd+K object search palette in DB viewer (Task 4.1)

* feat(ui): schema CRUD menu + dependency dialog (Task 4.2)

* feat(ui): copy-as-DDL + dependency view context menu in Objects (Task 4.3)

* feat(ui): dependency check before table drop + bundled-tool status (Task 4.4)

* docs: v0.7.5 release notes + status table + bundled-tools (Task 5.1)

* ci: build/verify bundled pg client tools per platform before tauri build (Task 5.2)

* fix(objects): report pg_rewrite dependencies as the dependent view (pg_class)

pg_depend records view dependencies via the view's internal rewrite rule
(classid = pg_rewrite). The user-facing dependent object is the VIEW itself,
so map that classid to pg_class (name still resolved through ev_class).
Fixes the live-PG integration test object_dependencies_for_table_includes_view
and makes the dependency dialog readable for view dependents.

* test: add idempotent PG integration-test seed script

Seeds the first PG test db (GRIDLINE_TEST_SRC) with the objects the
#[ignore] integration tests assert against: users (+users_id_seq),
products (3 rows), orders (3 rows), order_summary view, audit_log +
get_user functions, user_role enum. Idempotent: DROP + recreate.

* fix(build): regenerate multi-resolution icons + roadmap Keychain item

- icon.ico previously contained a single 16x16 frame (Windows scaled it
  up -> blurry taskbar/start-menu icon). Regenerated from the 512px source
  via 'tauri icon': ICO now has 16/24/32/48/64/256 frames, icns has full
  @2x coverage up to 1024px, PNGs re-rendered from the same source.
- Added icons/icon.png (512px) to bundle.icon so Linux hicolor installs
  a high-DPI entry.
- ROADMAP: log the 'Enable Keychain' toggle (currently a form-only
  placeholder) under Next up -> Connection & credentials.

* docs(readme): dynamic version-free download links + 3-col table

- release.yml: set releaseAssetNamePattern to '[name]_[platform]_[arch][setup][ext]'
  (version-free), so asset filenames are stable across releases:
  Gridline_darwin_aarch64.dmg, Gridline_windows_x64-setup.exe,
  Gridline_linux_amd64.deb, Gridline_linux_x86_64.rpm, etc.
- README: both download tables now 3-column (OS | Architecture | Download)
  and link via GitHub's releases/latest/download/<file> redirect — they
  always point at the newest published release, no per-release edits.
- AGENTS.md: releases checklist updated — download links stay version-free.

* docs(readme): platform-per-column download table (macOS | Windows | Linux)

Table now mirrors the release layout: one column per OS with a logo row
and a download-links row underneath. Links stay version-free via
releases/latest/download/<file> (releaseAssetNamePattern in release.yml).

* docs(readme): revert download table to clean image-less 3-col layout

Logo row was hard to read on GitHub dark mode; the plain OS | Architecture
| Download table is cleaner and still uses dynamic releases/latest links.

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