refactor: convert f-string logging to lazy %-style format (G004)

Sweep all 1676 G004 violations across 112 files, converting
`logger.<level>(f"…{x}…")` to `logger.<level>("…%s…", x)`.

Why: ruff rule G004 was added to pyproject.toml to enforce lazy
%-style logging — defers formatting until the log level is enabled
and lets structured log tooling match the unformatted template.

Conversion preserves rendered output byte-for-byte:
- `{x}` → `%s` + `x`
- `{x!r}` / `{x!s}` / `{x!a}` → `%r` / `%s` / `%a`
- Format specs (`{x:.2f}`, `{x:>10}`) → `%s` + `format(x, 'spec')`
  (printf-style specs aren't 1:1 with Python format specs, so we
  delegate to `format()` to keep identical output)
- Literal `%` → `%%`
- Concatenated f-strings (`f"a {x} " "b"`) flattened
- Trailing kwargs (`exc_info=True`) preserved

Verified:
- `uv run ruff check --select G004` → 0 violations
- `uv run ty check -- nextcloud_mcp_server` → passes
- `uv run pytest tests/unit/` → 1010 passed

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

nextcloud_mcp_server/client/sharing.py

@@ -72,8 +72,12 @@ class SharingClient(BaseNextcloudClient):
             )
 
         logger.info(
-            f"Created share {share_data['id']}: {path} -> {share_with} "
-            f"(type={share_type}, permissions={permissions})"
+            "Created share %s: %s -> %s (type=%s, permissions=%s)",
+            share_data["id"],
+            path,
+            share_with,
+            share_type,
+            permissions,
         )
         return share_data
 
@@ -99,7 +103,7 @@ class SharingClient(BaseNextcloudClient):
                 f"OCS API error: {data['ocs']['meta'].get('message', 'Unknown error')}"
             )
 
-        logger.info(f"Deleted share {share_id}")
+        logger.info("Deleted share %s", share_id)
 
     @retry_on_429
     async def get_share(self, share_id: int) -> dict[str, Any]:
@@ -206,5 +210,5 @@ class SharingClient(BaseNextcloudClient):
                 f"OCS API error: {result['ocs']['meta'].get('message', 'Unknown error')}"
             )
 
-        logger.info(f"Updated share {share_id}")
+        logger.info("Updated share %s", share_id)
         return result["ocs"]["data"]